A redated post from about two years ago.
I found a page I had written on some arguments for atheism which I am not sure I have ever written spelled out as such, but seem to be implicit in a lot of people's thinking. Here's one, the Argument from Intellectual Progress:
1) Human thought has progressed from the earliest days of humanity until now.
2) In the infancy of the human race, humans believe that everything was divine: rocks, trees, etc.
3) Then humans believed in many gods but rejected the divinity of rocks and trees.
4) Then humans went from polytheism to monotheism with the rise of Judaism, Christianity and Islam, reducing the number of deities to one (or three-in-one, as the case might be.
5) At first these religions were accepted with a full-blown supernaturalism. More recently, even adherents of these religions have seen fit to modify their commitment to the supernatural. They acknowledge that the supernatural exists but are more reticent than their ancestors in attibuting things to the supernatural.
6) In the Eighteenth Century belief in God was reduced by the deists to a being who would up the universe like a watch. In the nineteenth century, after Darwin, atheism became a serious possiblity for many intelligent poeple. No in many educated groups, atheism is virtually taken for granted.
7) If we trace the logical conclusion of human thought, we will find that it is leading in the direction of the rejection of gods entirely. Perhaps in the 24th Century most people will be atheists, with a few theists hanging on in the outlying counties.
Of course I don't buy this argument, as I think it falls victim to Lewis's critique of chronological snobbery. But I would like to get some discussion on this.