Prove a god exists... You cannot...
Define what a god is... You cannot...
If a god exists and you cannot define/prove it then it might as well not exist for all the good it does us.
We know maths exists because we can use it to quantify observations of our environment. This is testable and has a proven track record of accuracy. We also know the Earth is not flat because we can see it isn't. It does not matter what some people may or may not say about it.
You're analogies are awful and have no bearing on what you are trying to prove. You might find your time is better spent elsewhere...