Thats exactly it: being a good person is not the sole property of any one religion or people. One doesn't need to be a theist to be charitable or to be kind to strangers. I think the point Jesus was making was that the rules of religion were getting in the way of this which is exactly where the modern church has gone wrong.

I'm not sure I think its irrational to have a faith of some sort. I would agree that the blind faith of so many is irrational, happy to never dig any deeper than a sunday morning sermon and shy away from debate and criticism. Plenty of our best minds have been theists. Would we describe Isaac Newton, Michael Faraday or Georges Lemaître as irrational? I bet they had plenty of exciting debates in their day on the nature of all sorts of things!

I think about Dawkins and Conway-Morris, both highly acclaimed academics in their fields of respective biology and both professors at Oxford. Yet both operate at opposite ends of the theism spectrum. I wonder if they ever eat lunch together?