User blog comment:B214/Question and Answers 6/@comment-9595671-20160714212150/@comment-1359322-20160715015838

^^This. Just like how they are prayers and believers in Christianity, Taoism, Hinduism and so on. Buddhism also has prayers and their believers. In fact if you remember Volume 2, when Ise tried to recite the mantra, he got the same headache as he would when Devils pray to God.

And if we go by the context of religion in DxD, Buddha is pretty much the same as God in the fact that they're needed for the survival of the myth.

The reason why the Devils and Fallen Angels didn't expose the death of God despite being enemies of God is because it would hurt them too. If people start lost faith in Christianity due to death of the God of the Bible, then before long people would move to other religions and both Devils and Fallen Angels would suffer from lost of clientele (Devils can't make contract) and so on, come to worst all Three Faction may become prey of other myths.

In a way, it's kinda interesting how the Christianity faction works in DxD. If we go in context, a Satan could be a God too, for people who believe in the Devils, a Satan could be view as a God-like figure. And in the broader view, Angels benefit from there being people who believes in the Devils as well cause their religion grows bigger due to it.