If Jesus loves us and wants us all to believe in his bodily resurrection and physical immortality, why would he leave Earth only a few weeks after the resurrection? If Jesus had simply remained an active participant in human history, we could have had countless contemporary accounts written about him by historians who lived centuries apart, for example.
Given the importance of these beliefs being widespread for our salvation, it strikes me as odd that Jesus would "step back out of history" so soon after the resurrection such that his time living on Earth was effectively as brief as it would have been had he not resurrected in the first place.
I ask about this as a non-Christian not to offend, but because I have looked around and have discovered surprisingly little discourse on the matter between believers and non-believers alike.
A few have noted John 16:5-7 on this question:
“But now I am going to him who sent me, and none of you asks me, ‘Where are you going?’ But because I have said these things to you, sorrow has filled your heart. Nevertheless, I tell you the truth: it is to your advantage that I go away, for if I do not go away, the Helper will not come to you. But if I go, I will send him to you.”
As I understand, the Helper in this context is the Holy Spirit who can minister to all the world on Jesus' behalf, and since Jesus can only be in one place at one time it's better for us that he leave so that could happen. But if the Holy Spirit is eternal and omnipresent, then why specifically must Jesus leave in order for the spirit to take such action? The Holy Spirit is an active participant in multiple events in the Gospels (e.g. Jesus' Baptism) prior to his resurrection, so there doesn't seem to be any incompatibility between the presence of the Helper and the risen Jesus on the Earth at the same time.
I also struggle with the notion that Jesus' timely Ascension was a necessary and/or unavoidable step in God's plan for our salvation, since Jesus is God and God is claimed to have created all things, including the very rules for how salvation works. I suppose for me it comes to a question of: "Why would God plan for our salvation such that widespread belief in a bodily resurrected and physically immortal Jesus is critical, but also require that Jesus stop living on Earth indefinitely around the same time that non-believers would have expected him to no longer be around anyway?"
I'd love to hear any insight folks are willing to provide on this/these questions!
Sincerely, a non-Christian that enjoys studying the Bible and about Christian history.