First, I'd like to address one issue, I'm surprised someone else didn't mention this earlier, or maybe I missed it? Natural Selection and Evolution have no relation on how life started, just how it changed since it got here, there are numerous possibilities being explored that address how life started, but the validity of any of those has no impact on the validity of evolution, it is an observable fact.
Second, I find that there are essentially two mindsets that contribute to whether or not a person readily accepts evolution, and was touched on before, and is perfectly summed up in the Douglas Adams quote earlier in the thread. An evolutionist sees the location of Earth, the elements that were available when life began and all the other parameters followed by a long chain reaction that lead to us being here today, if any of these things had been different we would not be here today. I think a creationist rejects the idea that not being here was a possibility, and therefore thinks everything is as it is for the reason of us being here today.
I must admit that I have done very little reading about intelligent design, but was fairly confident until the last month or two that this was the theory of science because of god, god set the big bang in motion, god set the laws of physics, god made the mechanics of evolution etc. It seems that after the big uproar from expelled and other reading I've been doing that this is not the case and I am actually kind of curious as to what it actually is. At any rate, I do not see the problem with this belief, there is no contradiction, science is only revealing the mechanisms of god. Science today makes no mention of god because there is no proof, but most importantly, there is no necessity, but that does not mean that a god does not exist.
Imagine this scenario, I write a program to add two numbers together. Now imagine you "live in my computer" and are examining this program. If you're a creationist, you'd likely be saying "Zeeky Boogy Doog wrote that program and therefore should be credited!" If you're a scientist you'd be saying "The two numbers come from somewhere, we're not sure if it's one of the files on the hard drive or an external input, but the CPU processes the requested action, sends the two numbers through an ALU and arrives at the concrete answer you now see." Both are correct, I did write the program, but the cpu and alu did the work, the scientists simply see no reason to recognize the programmer because it has no relevance to the outcome of the addition.
Just for reference, I am an atheist. Also, I just did a refresh and this thread is dieing it seems, but it took me a while to type out because I kept getting up to do things at work, but it's long and I do love reading these discussions, so I'll go ahead and bump it.