The gravitational constant, if it were off by one part in a hundred million million, then the expansion of the universe after the Big Bang would not have occurred in the fashion that was necessary for life to occur. When you look at that evidence, it is very difficult to adopt the view that this was just chance.

Atheists sometimes come across as a bit arrogant in this regard, and characterizing faith as something only an idiot would attach themselves to.

To me, the right approach is to say we are profoundly ignorant of these matters. We need to work on them. But to suddenly say the answer is God - it's that that seems to me to close off the discussion.

If you don't understand how something works, never mind: just give up and say God did it. You don't know how the nerve impulse works? Good! You don't understand how memories are laid down in the brain? Excellent! Is photosynthesis a bafflingly complex process? Wonderful! Please don't go to work on the problem, just give up, and appeal to God.

It is interesting to ask whether there's any general reason why being religious might make you do nice things or indeed nasty things. It's possible that people do nice things because they're religious. One reason might be they're hoping for a reward in Heaven, which is not a very noble reason.

We accept that people are irrational for good Darwinian reasons. But I don't think we should be so pessimistic as to think that therefore we're forever condemned to be irrational.

Or why it is acceptable to train fast runners and high jumpers but not to breed them. I can think of some answers, and they are good ones, which would probably end up persuading me. But hasn't the time come when we should stop being frightened even to put the question?