Opinions differ on who introduced Aristotelianism into western Christianity; some scholars attribute this to Augustine of Hippo and others to Thomas Aquinas. The fact Boethius translated Augustine's work argues for the former.
Plotinus and Origen of Alexandria (ca. 185-254) were both students of Ammonius Saccas. Also, I have not heard or read of any Origen who influenced Christianity other than Origen of Alexandria, could you be more specific?
Jesus did not teach in an intellectual vacuum, he taught the Jews from a Hebrew perspective, after all Jesus was a Jew.
Psalms 146:3-4
3 Do not put your trust in princes,
Nor in a son of man, in whom there is no help.
4 His spirit departs, he returns to his earth;
In that very day his plans perish.
NKJV
Ecclesiastes 12:6-8
6 Remember your Creator before the silver cord is loosed,Or the golden bowl is broken,
Or the pitcher shattered at the fountain,
Or the wheel broken at the well.
7 Then the dust will return to the earth as it was,
And the spirit will return to God who gave it.
8 "Vanity of vanities," says the Preacher,
"All is vanity."
NKJV
What is the spirit that returns to God; the "breath of life".
Genesis 7:22
22 All in whose nostrils was the breath of life, of all that was in the dry land, died.
KJV
The same Hebrew word translated "soul" is also translated "creature".
Genesis 1:24
24 Then God said, "Let the earth bring forth the living creature according to its kind: cattle and creeping thing and beast of the earth, each according to its kind"; and it was so.
NKJV
What separates mankind from all other animals are our thoughts or plans and these perish when we die. However, our totality (breath and soul) will be reunited at the resurrection of the dead when those who have obeyed God will enter eternal life and those who disobeyed God will suffer the second death.
Isaiah 66:24
24 "And they shall go forth and look
Upon the corpses of the men
Who have transgressed against Me.
For their worm does not die,
And their fire is not quenched.
They shall be an abhorrence to all flesh."
NKJV
Mark 9:43-44
43 If your hand causes you to sin, cut it off. It is better for you to enter into life maimed, rather than having two hands, to go to hell, into the fire that shall never be quenched -- 44 where
'Their worm does not die
And the fire is not quenched.'
NKJV