i am happy for you to demonstrate the alleged non existence of God

No evidence, for any normal purposes, equals non-existence. How many times do we have to say this? If you want to propose and claim as rational the existence of something for which there is no evidence it is up to you convince others you are not just talking our your butt. Mind you, I'm completely fine with you believing in god and not needing any evidence. Just don't try to say that it is a rational belief, or that I should accept anything about it on your (or anyone else's) say so.

As soon as a believer gets into a debate about proving the existence of god, he or she has already lost the debate. Belief is, by its nature, irrational. Your only recourse is to say, "Yes, I believe in God, even though there isn't any clear reason for me to do so. So what?"