Think about it.

A few years ago, I was in church, and the pastor had brought in Scrabble letters. He dumped them on the stage (Yes, stage. Anyone else find it odd that churches now have stages?) and asked what the chances were that they would form a word. Very slim. Obviously, he was trying to show that there must have been some kind of intelligence that placed life here on earth...

Now, think on this:
Scientists estimate that in the Milky Way alone, there are between 1 and 30 billion planets. And, there are about 100 billion galaxies in the universe. I'll let you do the math as to how many planets that comes out to (hint: it's a lot more than a quintillion, which is one with eighteen zeros after it). Of course, many of those planets can't support life, so we'll be conservative and go with a billion billion available planets. So, even if the chances are as slim as one in a million, or one in a billion or even one in 500 billion, I'd say that life developing on earth, even without intelligent design, is not that improbable...

Just saying.

PS: I'm reading The God Delusion. Very interesting read, so far.