Jesus demonstrated reincarnation when He returned after His death on the cross.
In His discussion with Nicodemus, Jesus confirms that Nicodemus must reenter the womb. As an old man, he could not accomplish what Jesus requires from us - repay our debts - love our enemies - become perfect - so it was logical for him to ask about reincarnation. But Jesus said you need do more than just be born again, you need to become a spiritual person, to become virtuous.
Your interpretation fundamentally misrepresents what Jesus actually says in both passages.
First, Jesus did not demonstrate reincarnation by rising from the dead, He demonstrated resurrection, which is something entirely different.
Reincarnation involves a soul entering another earthly body through a new birth, Jesus did nothing of the sort.
He rose from the dead as the same Jesus who had been crucified, retaining His personal and bodily identity.
In Luke 24:39, the risen Christ explicitly demonstrates His bodily reality to the disciples, inviting them to touch Him. He then eats in their presence (Luke 24:42–43).
In John 20:27, He invites Thomas to examine the wounds in His hands and side.
Second, your interpretation of Jesus’ conversation with Nicodemus is even more problematic, because you have effectively reversed the meaning of the passage.
You write: “Jesus confirms that Nicodemus must reenter the womb.”
No. He does absolutely nothing of the sort.
In John 3:3–8 Jesus tells Nicodemus that he must be born anōthen, a Greek word that can mean either “again” or “from above.”
Nicodemus misunderstands this statement as referring to another physical birth and asks how an elderly man could possibly enter his mother’s womb again.
But Jesus responds by explaining that the birth He is describing is a birth of water and the Spirit (John 3:5).
He then explicitly distinguishes physical birth from spiritual birth in John 3:6.
In other words, Nicodemus introduces the idea of another physical birth because he misunderstands Jesus. Jesus then corrects his misunderstanding by explaining that He is speaking of spiritual regeneration.
And you have taken Nicodemus’ misunderstanding and presented it as though it were Christ’s actual teaching!
The biblical text establishes the very opposite of what you claim.
Third, your appeal to Jesus’ command to become perfect (Matthew 5:48) does not establish reincarnation either.
Read the immediate context: Jesus is instructing His disciples to love their enemies and imitate the Father’s goodness, which extends even to the wicked.
Nothing in that passage suggests that human beings must undergo multiple earthly lives to achieve perfection.
Nothing refers to karmic debts, successive incarnations, or the necessity of returning to earth in another body.
Gerhard
(Gerhard Nebe-von Caron, formerly "Marvin", Sceptic Christian)
83
you are born again / resurrected well before your physical death - or as I say:
to live forever
is the art
to learn to live
in Jesus heart
I suppose if I try really, really hard, and ignore a lot of stuff that I believe, I might get close to something almost like reincarnation, but you’re going to have work harder to persuade me that a sarx before a crucifixion became, after two nights separated by one whole day, a sarx after what took place in the tomb.
Nicodemus asks whether an old man can enter his mother’s womb a second time (John 3:4). Jesus responds by distinguishing birth of the flesh from birth of the Spirit (John 3:5–6).
Where, precisely, does Jesus confirm Nicodemus’s suggestion that he must physically reenter the womb?
“positively acknowledges” is your interpretation because that interpretation is essential to your theory.
On the contrary, in my interpretation, the double word “amen, amen” does not signal acknowledgement of what was said by Nicodemus before the “amen, amen”, it emphasizes what Jesus says next, as in: “Most assuredly, I say”.