Because religions are just stories.
And bad stories at that. I was brought up as a Buddhist, and the canon was full of old, tired tropes. Reincarnation, supernatural powers, heaven and hell, the whole gamut. The story of other religions are no different. The heroes just have different powers and the miracles come in many varieties. To be honest, I fell for the Buddhist stories until I entered university, and this fact still embarrasses me to this day.

