From third through fifth grade, I attended an Episcopal school. For a time, I believed what I was taught about religion there. But I do remember wondering what God looked like, and I remember being told not to try to picture God.
My act of defiance in the fourth grade was to picture God as someone like Lincoln in the Lincoln Memorial in D.C.
Now, when someone asks a question such as "Do you believe in God?" I wonder exactly what they mean by "God". Few people seem comfortable talking about this, and even fewer seem willing to try and define God. The answers I've gotten seem hopelessly vague, as though even asking for a definition of the concept of God (let alone any proof) is offensive.
As an adult, I'm unclear on the concept. If by God one means there are things we don't understand, I'm certainly a believer. If one means by God something much more concrete, I'm less certain. There are spiritual processes within myself that I experience and understand to some extent. I have some sense of how all things and all people in particular are connected. But I'm still unclear on what people mean by God, no matter what their particular religion might - or might not- be.