By "believe", do you mean just hold the belief that it somehow exists, as in "I believe black holes exist / dinosaurs existed (but this belief has zero effect in my day to day life)", or something more consequential?
I don't believe in a superior grand designer overlooking it all from "his" cloud castle, but if such a deity did exist, I would be profoundly amazed. I find it interesting to think that one could come to find it anything but consequential.