I'm an agnostic with a slight tilt toward Deist thinking that there is some "Cause" for the existence of the universe; that once the universe came into being, however that was accomplished, it was left to run on its own with no more interference needed from "Cause".
I guess then, you could say I believe in Santa Cause.
More seriously, the models of God offered by the Abrahamic religions just don't work for me. Without the caveat that God works in mysterious ways, their model doesn't explain why thing happen, or don't, or lend well to accurate prediction as do nature's laws of physics.
In any event, to those who practice a religion because it actually fosters their growth, I would say keep on keeping on. For those who practice a religion as a matter of form because someone in authority told them they had to, maybe their time would be better spent fishing, or golfing, or hiking in the great out-of-doors, or posting their thoughts on a blog.