You are putting words in my mouth, as well as the apostle Paul. The very scripture you use condemns your man made doctrine, not upholds it. You have missed the whole point of the Gospel, and continue to try and super impose your beliefs over the truth. Seeing Jesus, and believing in Jesus are not the same. The whole book of Hebrews actually condemns your false doctrine, not upholds it.
Hebrews 4:2; For unto us was the gospel preached, as well as unto them: but the word preached did not profit them, not being mixed with faith in them that heard it.
Hebrews 4:6; Seeing therefore it remaineth that some must enter therein, and they to whom it was first preached entered not in because of unbelief.
The scripture in 2Peter 2: ia a laundry list of what a false teacher is. No where in this scripture does it say that these folks were ever true believers. Once again, the dog did not become a sheep, then become a dog again.
Your hebrews 6 reference also comes up very short in proveing what you claim. The greek word you use is the same word we get our word photo. It means to see the picture. Once again the problem the Hebrews were haveing, is that they believed that Christ was not enough. Even after the big picture of the Gospel was presented, and even after the Holy Spirit hovered over them wooing them to surrender to Christ, and cease from their own works, they returned to the sacrificial worship of the Temple. The mistake of the Hebrews is your error as well. Grace plus works. It is only by grace thru faith, not of works, resting in the completed work of Christ alone.
John 6:35-40; 35] And Jesus said unto them,I am the bread of life: he that commeth to me shall never hunger; and he that believeth on me shall never thirst. 36]But I said unto you, That ye also have seen me, and believe not. 37] All that the Father giveth me shall come to me; and him that cometh to me I will in no wise cast out. 38] For I came down from heaven, not to do mine own will, but the will of Him that sent Me. 39] And this is the Father's will which hath sent me, that of all which He hath given me I should lose nothing, but should raise it up again at the last day. 40] And this is the will of Him that sent me, that every one that seeth the Son, and believeth on Him, may have everlasting life: and I will raise him up at the last day.