Important Unknowns You say that someone cannot be sure about the Non-Existence of the deity (any deity) but that is simply not true, is perfectly possible to prove a negative but the thing is, it is not necessary, nobody needs to "debunk" the existence of God because nobody has proven his/her existence in first place.
The problem is what you consider to be God...The Christian God? all-powerful, all-knowing in all places? So that would be a being that can do anything but doesn't do anything because he doesn't want to interfere but at the same time, he dictates who you should marry and what you should eat, the being that is all love but if you have sex before marriage you will burn throughout eternity?
Or maybe you talking about the Egyptians Gods, so now when you die you can take your employees and your money to the afterlife but at the gate, your heart will be weighed against a feather.
Or maybe you talking about a God that no human knows it but feels it and IT can do whatever whenever ignoring all rules of physics and chemistry.
But as you say there is no amount of logic and evidence that will convince someone that there is no god simply because they do not understand the evidence... and because of the complexity that the universe seems to have the only explanation is that something superior did it.
I have a different question for you mate, what would be an absolute proof that God does not exist?
Because for me absolute proof of God's existence would a simple hello.