You see, if you say something positive like the whole of life – all living things – is descended from a single common ancestor which lived about 4,000 million years ago and that we are all cousins, well that is an exceedingly important and true thing to say and that is what I want to say. Somebody who is religious sees that as threatening and so I am represented as attacking religion, and I am forced into responding to their reaction. But you do not have to see my main purpose as attacking religion. Certainly I see the scientific view of the world as incompatible with religion, but that is not what is interesting about it. It is also incompatible with magic, but that also is not worth stressing. What is interesting about the scientific world view is that it is true, inspiring, remarkable and that it unites a whole lot of phenomena under a single heading. And that is what is so exciting for me.

In very different ways, the possibility that the universe is teeming with life, and the opposite possibility that we are totally alone, are equally exciting. Either way, the urge to know more about the universe seems to me irresistible, and I cannot imagine that anybody of truly poetic sensibility could disagree.

There is no general reason to expect evolution to be progressive – even in the weak, value-neutral sense. There will be times when increased size of some organ is favoured and other times when decreased size is favoured. Most of the time, average-sized individuals will be favoured in the population and both extremes will be penalised. During these times the population exhibits evolutionary stasis (i.e., no change) with respect to the factor being measured. If we had a complete fossil record and looked for trends in some particular dimension, such as leg length, we would expect to see periods of no change alternating with fitful continuations or reversals in direction – like a weathervane in changeable, gusty weather.

همه‌چیز را بسنج؛ همواره باورهای خود را با واقعیات باز آزما، و آماده‌باش تا حتی عزیزترین باورهایت را هم که با واقعیت نمی‌خوانند کنار نهی. عقاید خود را مستقلاً و بر مبنای خرد و تجربه‌ی خود برگزین؛ نگذار دیگران تو را به پیروی کورکورانه بکشانند.

It is often said, mainly by the 'no-contests', that although there is no positive evidence for the existence of God, nor is there evidence against his existence. So it is best to keep an open mind and be agnostic. At first sight that seems an unassailable position, at least in the weak sense of Pascal's wager. But on second thoughts it seems a cop-out, because the same could be said of Father Christmas and tooth fairies. There may be fairies at the bottom of the garden. There is no evidence for it, but you can't prove that there aren't any, so shouldn't we be agnostic with respect to fairies?

If all the evidence in the universe turned in favour of creationism, I would be the first to admit it, and I would immediately change my mind. As things stand, however, all available evidence (and there is a vast amount of it) favours evolution.

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The absolute morality that a religious person might profess would include what, stoning people for adultery, death for apostasy, punishment for breaking the Sabbath. These are all things which are religiously based absolute moralities. I don't think I want an absolute morality. I think I want a morality that is thought out, reasoned, argued, discussed and based upon, I'd almost say, intelligent design [pun intended]. Can we not design our society, which has the sort of morality, the sort of society that we want to live in – if you actually look at the moralities that are accepted among modern people, among 21st century people, we don't believe in slavery anymore. We believe in equality of women. We believe in being gentle. We believe in being kind to animals. These are all things which are entirely recent. They have very little basis in Biblical or Quranic scripture. They are things that have developed over historical time through a consensus of reasoning, of sober discussion, argument, legal theory, political and moral philosophy. These do not come from religion. To the extent that you can find the good bits in religious scriptures, you have to cherry pick. You search your way through the Bible or the Quran and you find the occasional verse that is an acceptable profession of morality and you say, ‘Look at that. That’s religion,’ and you leave out all the horrible bits and you say, ‘Oh, we don’t believe that anymore. We’ve grown out of that.’ Well, of course we've grown out it. We've grown out of it because of secular moral philosophy and rational discussion.

We've reached a truly remarkable situation: a grotesque mismatch between the American intelligentsia and the American electorate. A philosophical opinion about the nature of the universe which is held by the vast majority of top American scientists, and probably the majority of the intelligentsia generally, is so abhorrent to the American electorate that no candidate for popular election dare affirm it in public. If I'm right, this means that high office in the greatest country in the world is barred to the very people best qualified to hold it: the intelligentsia, unless they are prepared to lie about their beliefs. To put it bluntly American political opportunities are heavily loaded against those who are simultaneously intelligent and honest.

Remember, all I am trying to establish for the moment is that we do not, as a matter of fact, derive our morals from scripture. Or, if we do, we pick and choose among the scriptures for the nice bits and reject the nasty. But then we must have some independent criterion for deciding which are the moral bits: a criterion which, wherever it comes from, cannot come from scripture itself and is presumably available to all of us whether we are religious or not.

It would be intolerant if I advocated the banning of religion, but of course I never have. I merely give robust expression to views about the cosmos and morality with which you happen to disagree. You interpret that as ‘intolerance’ because of the weirdly privileged status of religion, which expects to get a free ride and not have to defend itself. If I wrote a book called The Socialist Delusion or The Monetarist Delusion, you would never use a word like intolerance. But The God Delusion sounds automatically intolerant. Why? What’s the difference? I have a (you might say fanatical) desire for people to use their own minds and make their own choices, based upon publicly available evidence. Religious fanatics want people to switch off their own minds, ignore the evidence, and blindly follow a holy book based upon private ‘revelation’. There is a huge difference.