To argue against the hypothetical, the conceptual problems with an “afterlife” is one reason why I tend to lean towards Annihilationism - Wikipedia, which we discussed in this post: Has this theological concept had adherents/ been given a name?
As someone who takes Christianity semi-seriously, what little can be read between the lines in the Bible about after death seems at least to me to lend credence to this idea. Jesus says that God is the God of the living, not of the dead, and Thessalonians says that the passed away “sleep” in Christ. It’s also said of God that Heaven is his throne and Earth is his footstool. Plus of course the fact that the book of Revelations says that after the end of our current universe there will be a new heaven and a new Earth. IOW, physical existence seems to count for something. What “The Kingdom of Heaven” is I don’t profess to know; but it’s supposable that it’s more of realm of Platonic archetypes, of existence in potentia.