Dear Abdullah, not all biblical scholars are believers, and orthodox Christianity teaches the Father, Son, and Holy Spirit is God. Before I prove this using Biblical passages, let me first show that the Bible we have today is the exact same as it has always been:
Old Testament
How do we know the Bible has been kept in tact for over 2,000 years of copying? Before the discovery of the Dead Sea Scrolls our earliest Hebrew copy of the Old Testament was the Masoretic text dating around 800 A.D. The Dead Sea Scrolls date around the time of Jesus copied by the Qumran community, a Jewish sect living around the Dead Sea. We also have the Septuagint which is a Greek translation of the Old Testament dating in the second century B.C. When we compare these texts which have an 800-1000 years gap between them we are amazed that 95% of the texts are identical with only minor variations and a few discrepancies.
New Testament
In considering the New Testament we have tens of thousands of manuscripts of the New Testament in part or in whole dating from the second century A.D. to the late fifteenth century when the printing press was invented. These manuscripts have been found in Egypt, Palestine, Syria, Turkey, Greece, and Italy, making collusion unlikely. The oldest manuscript, the John Rylands manuscript has been dated to 125 A.D. and was found in Egypt, some distance from where the New Testament was originally composed Asia Minor). Many early Christian papyri were discovered in 1935, which have been dated to 150 A.D., and include the four gospels. The Papyrus Bodmer II, discovered in 1956, has been dated to 200 A.D. and contains 14 chapters and portions of the last seven chapters of the gospel of John. The Chester Beatty biblical papyri, discovered in 1931, has been dated to 200-250 A.D. and contains the Gospels, Acts, Paul's Epistles, and Revelation. The number of manuscripts is extensive compared to other ancient historical writings, such as Caesar's "Gallic Wars" (10 Greek manuscripts, the earliest 950 years after the original), the "Annals" of Tacitus (2 manuscripts, the earliest 950 years after the original), Livy (20 manuscripts, the earliest 350 years after the original), and Plato (7 manuscripts).
With all of the massive manuscript evidence you would think we would have massive discrepancies - just the opposite is true. New Testament manuscripts agree in 99.5% of the text (compared to only 95% for the Iliad). Most of the discrepancies are in spelling and word order. A few words have been changed or added. There are two passages that are disputed but no discrepancy is of any doctrinal significance. Most Bibles include the options as footnotes when there are discrepancies. How could there be such accuracy over 1,400 years of copying? Two reasons: The scribes that did the copying had meticulous methods for checking their copies for errors. 2) The Holy Spirit made sure we would have an accurate copy of God's word so we would not be deceived. The Mormons, liberals as well as other cults and false religions such as Islam that claim the Bible has been tampered with are completely proven false by the extensive, historical manuscript evidence.--godandscience.org
Now that the reliability of the Bible has just been shown, it is time to prove that the Bible teaches the Father, Son, and Holy Spirit is God:
Old Testament showing oneness in distinction
Gen 2.24--the man and his wife will be one (ehad) flesh--clearly a composite unity.
Ex 26:6, 11--the fifty gold clasps are used to hold the curtains together so that the tent would be a unit (ehad).
2 Samuel 2:25--many soldiers made themselves into 'one group' (ehad)
Gen 34:16 --the men of Shechem suggest intermarriage with Jacob's children in order to become 'one(ehad) people'.
Joshua 9.2 -- the western kings agree to fight Joshua as "one (ehad) force"
Josh 10.42-- "And Joshua captured all these kings and their lands at one (ehad) time" (NAS) or "All these kings and their lands Joshua conquered in one (ehad) campaign" (NIV)
Ex 24.3 --"Then Moses came and recounted to the people all the words of the Lord and all the ordinances; and all the people answered with one (ehad) voice, and said"
2 Chr 5.12--"and all the Levitical singers, Asaph, Heman, Jeduthun, and their sons and kinsmen, clothed in fine linen, with cymbals, harps, and lyres, standing east of the altar, and with them one hundred and twenty priests blowing trumpets 13 in unison when the trumpeters and the singers were to make themselves heard with one (ehad) voice to praise and to glorify the Lord"
Gen 11.6--"And the Lord said, “Behold, they are one (ehad) people, and they all have the same language."--christian-thinktank.com
The Old Tesement and the Trinity
http://www.biblicalresources.org/cms/printer_48.shtml
The New Testament and the Trinity
This is how the birth of Jesus Christ came about: His mother Mary was pledged to be married to Joseph, but before they came together, she was found to be with child through the Holy Spirit. 19 Because Joseph her husband was a righteous man and did not want to expose her to public disgrace, he had in mind to divorce her quietly. 20 But after he had considered this, an angel of the Lord appeared to him in a dream and said, "Joseph son of David, do not be afraid to take Mary home as your wife, because what is conceived in her is from the Holy Spirit. 21 She will give birth to a son, and you are to give him the name Jesus, because he will save his people from their sins." 22 All this took place to fulfill what the Lord had said through the prophet: 23 "The virgin will be with child and will give birth to a son, and they will call him Immanuel" -- which means, "God with us." (Matt 1.18ff)
And do not think you can say to yourselves, `We have Abraham as our father.' I tell you that out of these stones God can raise up children for Abraham. 10 The ax is already at the root of the trees, and every tree that does not produce good fruit will be cut down and thrown into the fire. 11 "I baptize you with water for repentance. But after me will come one who is more powerful than I, whose sandals I am not fit to carry. He will baptize you with the Holy Spirit and with fire. (Matt 3.9)
16 As soon as Jesus was baptized, he went up out of the water. At that moment heaven was opened, and he saw the Spirit of God descending like a dove and lighting on him. 17 And a voice from heaven said, "This is my Son, whom I love; with him I am well pleased." (Matt 3.16f)
Then Jesus was led by the Spirit into the desert to be tempted by the devil. 2 After fasting forty days and forty nights, he was hungry. 3 The tempter came to him and said, "If you are the Son of God, tell these stones to become bread." 4 Jesus answered, "It is written: `Man does not live on bread alone, but on every word that comes from the mouth of God.'"(Matt 4.1ff)
But when they arrest you, do not worry about what to say or how to say it. At that time you will be given what to say, 20 for it will not be you speaking, but the Spirit of your Father speaking through you. 21 "Brother will betray brother to death, and a father his child; children will rebel against their parents and have them put to death. 22 All men will hate you because of me, but he who stands firm to the end will be saved. 23 When you are persecuted in one place, flee to another. I tell you the truth, you will not finish going through the cities of Israel before the Son of Man comes. (Matt 10.19f)
But if I drive out demons by the Spirit of God, then the kingdom of God has come upon you. [Matt 12.28]
Therefore go and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, (Matt 28.19)
While Jesus was teaching in the temple courts, he asked, "How is it that the teachers of the law say that the Christ is the son of David? 36 David himself, speaking by the Holy Spirit, declared: "`The Lord said to my Lord: "Sit at my right hand until I put your enemies under your feet."' 37 David himself calls him `Lord.' How then can he be his son?" (Mark 12.35)
for he will be great in the sight of the Lord. He is never to take wine or other fermented drink, and he will be filled with the Holy Spirit even from birth. 16 Many of the people of Israel will he bring back to the Lord their God. 17 And he will go on before the Lord, in the spirit and power of Elijah, to turn the hearts of the fathers to their children and the disobedient to the wisdom of the righteous -- to make ready a people prepared for the Lord." (Lk 1.15ff)
But the angel said to her, "Do not be afraid, Mary, you have found favor with God. 31 You will be with child and give birth to a son, and you are to give him the name Jesus. 32 He will be great and will be called the Son of the Most High. The Lord God will give him the throne of his father David, 33 and he will reign over the house of Jacob forever; his kingdom will never end." 34 "How will this be," Mary asked the angel, "since I am a virgin?" 35 The angel answered, "The Holy Spirit will come upon you, and the power of the Most High will overshadow you. So the holy one to be born will be called the Son of God. (Lk 1.30f)
His father Zechariah was filled with the Holy Spirit and prophesied: 68 "Praise be to the Lord, the God of Israel, because he has come and has redeemed his people. 69 He has raised up a horn of salvation for us in the house of his servant David (Lk 1.67)
Now there was a man in Jerusalem called Simeon, who was righteous and devout. He was waiting for the consolation of Israel, and the Holy Spirit was upon him. 26 It had been revealed to him by the Holy Spirit that he would not die before he had seen the Lord's Christ. 27 Moved by the Spirit, he went into the temple courts. When the parents brought in the child Jesus to do for him what the custom of the Law required, 28 Simeon took him in his arms and praised God, saying: 29 "Sovereign Lord, as you have promised, you now dismiss your servant in peace. 30 For my eyes have seen your salvation, 31 which you have prepared in the sight of all people, 32 a light for revelation to the Gentiles and for glory to your people Israel." (Lk 2.25f)
Jesus answered, "It says: `Do not put the Lord your God to the test.'" 13 When the devil had finished all this tempting, he left him until an opportune time. 14 Jesus returned to Galilee in the power of the Spirit, and news about him spread through the whole countryside. (Lk 4.12)
21 At that time Jesus, full of joy through the Holy Spirit, said, "I praise you, Father, Lord of heaven and earth, because you have hidden these things from the wise and learned, and revealed them to little children. Yes, Father, for this was your good pleasure. (Lk 10.21)
"I tell you, whoever acknowledges me before men, the Son of Man will also acknowledge him before the angels of God. 9 But he who disowns me before men will be disowned before the angels of God. 10 And everyone who speaks a word against the Son of Man will be forgiven, but anyone who blasphemes against the Holy Spirit will not be forgiven. (Lk 12.8f)
Then John gave this testimony: "I saw the Spirit come down from heaven as a dove and remain on him. 33 I would not have known him, except that the one who sent me to baptize with water told me, `The man on whom you see the Spirit come down and remain is he who will baptize with the Holy Spirit.' 34 I have seen and I testify that this is the Son of God." (Jn 1.32)
"The one who comes from above is above all; the one who is from the earth belongs to the earth, and speaks as one from the earth. The one who comes from heaven is above all. 32 He testifies to what he has seen and heard, but no one accepts his testimony. 33 The man who has accepted it has certified that God is truthful. 34 For the one whom God has sent speaks the words of God, for God gives the Spirit without limit. 35 The Father loves the Son and has placed everything in his hands. (Jn 3.31ff)
"If you love me, you will obey what I command. 16 And I will ask the Father, and he will give you another Counselor to be with you forever -- 17 the Spirit of truth. The world cannot accept him, because it neither sees him nor knows him. But you know him, for he lives with you and will be in you. (Jn 14.15)
"All this I have spoken while still with you. 26 But the Counselor, the Holy Spirit, whom the Father will send in my name, will teach you all things and will remind you of everything I have said to you. (Jn 14.25)
"When the Counselor comes, whom I will send to you from the Father, the Spirit of truth who goes out from the Father, he will testify about me. (Jn 15.26)
But I tell you the truth: It is for your good that I am going away. Unless I go away, the Counselor will not come to you; but if I go, I will send him to you. 8 When he comes, he will convict the world of guilt in regard to sin and righteousness and judgment: 9 in regard to sin, because men do not believe in me; 10 in regard to righteousness, because I am going to the Father, where you can see me no longer; 11 and in regard to judgment, because the prince of this world now stands condemned. (Jn 16.7)
Again Jesus said, "Peace be with you! As the Father has sent me, I am sending you." 22 And with that he breathed on them and said, "Receive the Holy Spirit. (Jn 20.16)
On one occasion, while he was eating with them, he gave them this command: "Do not leave Jerusalem, but wait for the gift my Father promised, which you have heard me speak about. 5 For John baptized with water, but in a few days you will be baptized with the Holy Spirit." (Acts 1.4)
7 He said to them: "It is not for you to know the times or dates the Father has set by his own authority. 8 But you will receive power when the Holy Spirit comes on you; and you will be my witnesses in Jerusalem, and in all Judea and Samaria, and to the ends of the earth." (Acts 1.7)
God has raised this Jesus to life, and we are all witnesses of the fact. 33 Exalted to the right hand of God, he has received from the Father the promised Holy Spirit and has poured out what you now see and hear. (Acts 2.32)
Peter replied, "Repent and be baptized, every one of you, in the name of Jesus Christ for the forgiveness of your sins. And you will receive the gift of the Holy Spirit. 39 The promise is for you and your children and for all who are far off -- for all whom the Lord our God will call." [Acts 2.38]
Then Peter, filled with the Holy Spirit, said to them: "Rulers and elders of the people! 9 If we are being called to account today for an act of kindness shown to a cripple and are asked how he was healed, 10 then know this, you and all the people of Israel: It is by the name of Jesus Christ of Nazareth, whom you crucified but whom God raised from the dead, that this man stands before you healed. [Acts 4.8]
When they heard this, they raised their voices together in prayer to God. "Sovereign Lord," they said, "you made the heaven and the earth and the sea, and everything in them. 25 You spoke by the Holy Spirit through the mouth of your servant, our father David: "`Why do the nations rage and the peoples plot in vain? 26 The kings of the earth take their stand and the rulers gather together against the Lord and against his Anointed One.' (Acts 4.24)
Now, Lord, consider their threats and enable your servants to speak your word with great boldness. 30 Stretch out your hand to heal and perform miraculous signs and wonders through the name of your holy servant Jesus." 31 After they prayed, the place where they were meeting was shaken. And they were all filled with the Holy Spirit and spoke the word of God boldly. (Act 4.29)
The God of our fathers raised Jesus from the dead -- whom you had killed by hanging him on a tree. 31 God exalted him to his own right hand as Prince and Savior that he might give repentance and forgiveness of sins to Israel. 32 We are witnesses of these things, and so is the Holy Spirit, whom God has given to those who obey him." (Acts 5.30)
"You stiff-necked people, with uncircumcised hearts and ears! You are just like your fathers: You always resist the Holy Spirit! 52 Was there ever a prophet your fathers did not persecute? They even killed those who predicted the coming of the Righteous One. And now you have betrayed and murdered him -- 53 you who have received the law that was put into effect through angels but have not obeyed it." 54 When they heard this, they were furious and gnashed their teeth at him. 55 But Stephen, full of the Holy Spirit, looked up to heaven and saw the glory of God, and Jesus standing at the right hand of God. 56 "Look," he said, "I see heaven open and the Son of Man standing at the right hand of God." (Acts 7.51ff)
When the apostles in Jerusalem heard that Samaria had accepted the word of God, they sent Peter and John to them. 15 When they arrived, they prayed for them that they might receive the Holy Spirit, 16 because the Holy Spirit had not yet come upon any of them; they had simply been baptized into the name of the Lord Jesus. 17 Then Peter and John placed their hands on them, and they received the Holy Spirit. (Acts 8.14f)
But the Lord said to Ananias, "Go! This man is my chosen instrument to carry my name before the Gentiles and their kings and before the people of Israel. 16 I will show him how much he must suffer for my name." 17 Then Ananias went to the house and entered it. Placing his hands on Saul, he said, "Brother Saul, the Lord -- Jesus, who appeared to you on the road as you were coming here -- has sent me so that you may see again and be filled with the Holy Spirit." 18 Immediately, something like scales fell from Saul's eyes, and he could see again. He got up and was baptized, 19 and after taking some food, he regained his strength. Saul spent several days with the disciples in Damascus. 20 At once he began to preach in the synagogues that Jesus is the Son of God. (Acts 9.15)
how God anointed Jesus of Nazareth with the Holy Spirit and power, and how he went around doing good and healing all who were under the power of the devil, because God was with him. [Acts 10.38]
"As I began to speak, the Holy Spirit came on them as he had come on us at the beginning. 16 Then I remembered what the Lord had said: `John baptized with water, but you will be baptized with the Holy Spirit.' 17 So if God gave them the same gift as he gave us, who believed in the Lord Jesus Christ, who was I to think that I could oppose God?" (Acts 11.15)
When he arrived and saw the evidence of the grace of God, he was glad and encouraged them all to remain true to the Lord with all their hearts. 24 He was a good man, full of the Holy Spirit and faith, and a great number of people were brought to the Lord. (Acts 11.23)
After much discussion, Peter got up and addressed them: "Brothers, you know that some time ago God made a choice among you that the Gentiles might hear from my lips the message of the gospel and believe. 8 God, who knows the heart, showed that he accepted them by giving the Holy Spirit to them, just as he did to us. 9 He made no distinction between us and them, for he purified their hearts by faith. 10 Now then, why do you try to test God by putting on the necks of the disciples a yoke that neither we nor our fathers have been able to bear? 11 No! We believe it is through the grace of our Lord Jesus that we are saved, just as they are." (Acts 15.7)
Paul and his companions traveled throughout the region of Phrygia and Galatia, having been kept by the Holy Spirit from preaching the word in the province of Asia. 7 When they came to the border of Mysia, they tried to enter Bithynia, but the Spirit of Jesus would not allow them to. 8 So they passed by Mysia and went down to Troas. 9 During the night Paul had a vision of a man of Macedonia standing and begging him, "Come over to Macedonia and help us." 10 After Paul had seen the vision, we got ready at once to leave for Macedonia, concluding that God had called us to preach the gospel to them. (Acts 16.6)
"And now, compelled by the Spirit, I am going to Jerusalem, not knowing what will happen to me there. 23 I only know that in every city the Holy Spirit warns me that prison and hardships are facing me. 24 However, I consider my life worth nothing to me, if only I may finish the race and complete the task the Lord Jesus has given me -- the task of testifying to the gospel of God's grace. (Acts 20.22f)
They arranged to meet Paul on a certain day, and came in even larger numbers to the place where he was staying. From morning till evening he explained and declared to them the kingdom of God and tried to convince them about Jesus from the Law of Moses and from the Prophets. 24 Some were convinced by what he said, but others would not believe. 25 They disagreed among themselves and began to leave after Paul had made this final statement: "The Holy Spirit spoke the truth to your forefathers when he said through Isaiah the prophet: (Acts 28.23)--christian-thinktank.com