This is from the book God: The Failed Hypothesis---I've been on the thread asking for proof that there IS a God. Well I don't need proof. I see it everyday. I call it faith. So I'd like to turn the tables on those so called scholars and ask them to show me proof that he DOESN'T EXIST....So come one, prove it.
1.Hypothesize a God who plays an important role in the universe.
2.Assume that God has specific attributes that should provide objective evidence for his existence.
3.Look for such evidence with an open mind.
4.If such evidence is found, conclude that God may exist.
5.If such objective evidence is not found, conclude beyond a reasonable doubt that a God with these properties does not exist.
As of yet, there is no evidence that god exists, therefore it's rational to conclude that god does not exist.
Just as you say you don't need proof that god exists because of faith (which is not scientific), I can say that god does not exist because there is no proof or evidence.