I think it's more productive to look at the question of consciousness and immortality outside the context of religious doctrines and narratives. Religion provides answers to this question, as does Science, but they don't exhaust all of the possibilities. There's a deeper epistemological issue here about what we know about consciousness and what we can say with certainty about first-person experience.

If this life is a classroom, as I have been told, then there are teachers and test administrators. The administrators withhold certain evidence of the past in order to help us focus on more important things. They want to help us grow in faith, charity, and other values, not just analytical ability.

People are not perfect and prophets are people. I know of a prophet who said Jesus was born in Jerusalem. Jesus was born in Bethlehem, not Jerusalem. Does that invalidate that prophet? No, he was addressing a people who didn't know the eastern lands very well and he was simplifying. Context is everything, even though we don't always know the full context.

If I were sure about what to believe, it wouldn't be belief anymore; it would be knowledge. If I only acted on things I am certain about, I would do almost nothing, since there is very little I am absolutely certain about. Life became more fulfilling and interesting when I learned to act on not only things I know, but also things I believe. Acting on belief leads to growth and ever increasing certainty that I am making choices that benefit me and my family.