Patriarchy - no, if he exists as he is supposed to exist by classical Christian, Muslim, Jewish, Hindu and Sikh theology, then he is not part of the universe. He couldn't be, logically, if he created it. So direct scientific evidence is logically impossible. There are however, other kinds of evidence - philosophical, experiential, historical. What I'm saying is that there is a chain of reasoning involved. It's naive to assume that religion is irrational, when some of the best minds who we have access to have been thoughtfully reasoning it out for millennia. There's a breath taking arrogance in the assumption that they must all have been irrational idiots - we're talking about most people, in the world now and in the past.
Beep - i think there's an element of taking things on trust in most of our beliefs - i haven't proven, myself, the second law of thermodynamics, but i do believe it because i a) trust those who have made a study of it that they know what they're talking about and b) trust that they wouldn't lie to me about it. I think it's fair to do the same with religion, to rely on experts as long as you weigh up the credentials of those experts i.e. Their trustworthiness. Blind faith, no questioning, would and does definitely spiral into irrationality.
I don't think circumcision is a hill to die on. But then I'm not a Jew. But i do believe in pointing it out when people appropriate science unquestioningly, disregarding all other aspects of logical thought and then have the balls to call others irrational.