I see him as a baptized Christian who isn’t really religious at all. Which is pretty much what we always see in the comics.

I've always seen him as an atheist.

Why Tho

Implications in the past. I believe one of the Loeb/Sale books has Alfred mentioning how Bruce isn't much for prayer. Then there's the "And I cannot even pray, for I have no god." line from Arkham Asylum. Generally, he's a rational thinker and a man of science. It would make sense.

Also tho Their is a comic where Batman gets the holy grail and is a descendant of a Knight order that fights for god to protect the holy grail and he is in awe and says to Alfred can you believe the son of god took a drink from this cup the book is called Batman the holy grail I think

This is the comic

Haha done have

I can't really do much with that link because I'm on my phone and it doesn't seem to be mobile friendly.

I always imagined him as a deist, he's seen a bunch of crazy stuff, but doesn't really have time for organized religion.