Joshua Sowin explains why he believes in evolution:
There are times in our lives when the scales fall from our eyes and we see something clearly for the first time. For me, it usually happens through reading books.
Looking back, the experience often seems instantaneous, but it always takes cultivation. Because of my experiences and reading I was at a place where it was possible for me to believe the earth was old. So when I picked up A Short History of Nearly Everything by Bill Bryson, I was in danger of reading it with an open mind.
As I read, my belief in a young earth crashed down. None of the arguments made sense anymore. There was too much evidence for an old earth. When did all those gigantic asteroids hit the earth (or the moon)? When did the mega-volcanoes (like Yellowstone) erupt? How could the fossil record be so consistently layered and dated? These sorts of questions finally led me to accept that the earth is around four and a half billion years old.