What do millenia-old books have to do with modern living?
If you are talking about an accurate description of observable reality, not much:
No Power of Prayer in healing.
Intelligence, Religousity, and Level of Education:
If you are talking about helping people and their countries live better, more moral lives, no:
Prison Population Demographics by Religion
Important Desicions made by people in authority, hell yes.
Why do people believe weird things?