Sigh, You might be sick of it. However, that is the standard response you give.. (PRAY TO GOD AND HE'LL ANSWER), and when people try to do that you just claim they don't believe.
That just looks like a case of self delusion to me. You are right though, god is either there nor not. The bible says a lot of things about god. So does the Vedas, So does the Koran. That doesn't mean it is true.
YOu ask questions. I say when you pray, you are probing your inner conciousness, and you share your thoughts with yourself. I rather suspect you can't demonstrate any differently, although you might fervently believe otherwise.