If you really believe something, you will act in accordance with that belief - always. If you believe in gravity, you will never attempt to defy it. If you claim to hold a belief but act incongruently, then you don't actually believe it. You're only kidding yourself. Casual faith isn't.
One of my core beliefs is that belief itself is a choice that can be made of our own free will.
Your beliefs about reality become your beliefs about yourself.
Curiosity is more flexible and practical than belief.