If someone simply just doesn’t believe in the faith of Christianity to begin with, that’s one thing. But in our post-Christian society…for those who’ve walked away from it, or for those who no longer find it attractive, or for those who have come to no longer believe in it…those are the reasons that the OP was pertaining to. For those who once embraced it, who no longer embrace it, why is that…?
Perhaps they begin to question. Which is a good thing.
