Venus,
I like that you pose questions like this. I think it makes people think.
Personally, I like the way Joseph Campbell talks about how different views of God are like "masks". We have many, many religions and doctrines. Also, many personal views about what/who God is. Obviously they cannot all be right. (People make their biggest mistakes fighting over their views on this). They are simply man's attempt to describe "the ground of being". They point to which is greater than ourselves. The reality of God is much grander than whatever we can imagine. Can we prove God exists in a tangible way? In a way that involves touching and feeling? No, of course not. Does that mean an immaterial God does not exist? I don't think so. Can we experience God? I believe we can.
Can math be a pointer to a "great mind"? I believe it can and does.