Full disclosure, I am an atheist. However that being said if I came to believe in the Christian God I would have no idea--and no way to find out with any certainty--which Christian religion is the true religion. Some Christian denominations preach that failure to believe in their dogma would bar me from heaven, and damn me to hell or its equivalent.
So, I wonder, how does any Christian know with any certainty that they are on the right path to salvation? It seems to me no Christian can be even reasonably sure that, despite their belief in God and Jesus, that they can be assured of anything after death like everlasting life, given the enormous disagreement between Christians. If Christians can't agree on how to be a Christian and honor, worship, and serve God, how is a converted atheist supposed to choose (and choose one must some Christian denominations claim) which is the correct path?
How, I wonder, can any Christian be believed? How can one know who is right and who is wrong?
It seems to me that every Christian, no matter how true their faith, is condemned to their own insoluble Pascal's Wager. They cannot know the true faith. How awful, it seems to me, to know that despite a belief in God and Jesus and faithfully serving them both that a Christian can still suffer internal damnation for merely failing to choose the right Christian religion.