This is going to come off smug and arrogant - but - I never really had this issue. To believe in God all I have to do is think of what God is. That reminds me of my idea / notion of God, and then, I believe in it. Also, my title and signature help remind me what God is: "From Omniverse to Omnitheism" and "God is what nature is becoming." So simple and quaint, yet so powerful. If I ever tell anyone I don't believe in God it's only because they've defined that God as some old man living in the sky. I don't believe in a God like that, but I do believe that things are being deified as time goes on, as each identity is becoming more and more Omniversal. Since I deify The Omniverse, the one thing that's always been and forever will be, it's really no question or concern if I believe in God. I believe in eternal progression, to me that is God. That's why I wear two tattoos to remind myself of that. I'm married to the concept, infinity, that will never happen - but each day we all get closer to it.