The more our beliefs align with reality it allows us to make the best possible decisions here in the real world. Religion and Faith goes directly against that. It lets them believe whatever they wish to be true. It also lets them believe things that conflict with other Faith beliefs. There is no actual method to accept the claims of holy books or think that any gods exist without that Faith. They use that Faith to make up their world view and to "answer" what are supposed to be the most important questions.