Sorry...haven't been back sooner.
Right. So doorbell went and I answered. He said "Hello. May I ask about your relationship with Jesus?"
I said, "Don't have one. I'm an atheist. Bye". Went to close the door and he said very patronisingly...."Oh you're an atheist. Ha ha. Well, what do you think is going to happen when you die, then?" His tone irritated me, so I bit and got into a discussion.
Let him launch into the watchmaker analogy, lack of evidence for evolution, the Bible is all the proof we need, and god of the gaps regarding the Big Bang.
So put him right - sticking the the facts. And to those commenters suggesting this was me giving my opinion - nope. My lack of belief is based on the facts at our disposal - the FACT of evolution, the inconsistency of the Bible (and the Christian habit of cherry picking), the obvious logical fallacy of thinking that because we design things like watches, this means that everything else is designed too ("Are you telling me you see no difference between a watch and a pebble?" etc) and that just because the cause (if there was one) of the BB is not something science can currently explain does not mean we must default to "Godmusthavedunit".
He tried to interrupt all the way through - but I ploughed on as he had done.
When I finished he accused me (and Richard Dawkins!) of being arrogant, insensitive and disrespectful of people's personal beliefs etc.
I said, if your beliefs are so personal - why knock on my door and bother me with them? This is my PERSONAL home. And I told him that, while I respect his right to his belief, I do not respect the beliefs themselves because they are fatuous and childish.
Then he said he's pray for me, and I shamelessly quoted Hitch and said "Thanks. And I'll think for you".
And closed the door in his sad looking face.