As for me, I believed in evolution because of the way it's presented: It happened, and that's all there is to it. Everywhere you go, everything you read or hear, whenever origins of life are discussed, evolution is presented as an unassailable fact. Well, I listened to some Creationist speakers, read their material — and asked my own questions. So, I rejected evolutionism (it's a belief system, you see) on scientific grounds and credibility. Now the boys want me to explain myself in writing about the "credibility" part. I'd normally tell them to shut up and get back to work, but this is something I wanted to get into anyway.
Credibility is something that presents itself as believable. Does it make sense? When someone constantly tells lies, they are no longer credible, and you can't trust them. When something is presented with reason, logic, examples and proof, it becomes credible and you believe it. Part of what happens is that you mix in your own learning, thinking and experiences, and then decide if you can believe something or someone.
Evolution is presented as a fact. (This is interesting because the arrogant atheist jumps on the chance to disbelieve in a creator and still have an explanation for the existence of life.) More than this, it's presented as a law of the universe. There is a book called The Wisdom of Evolution. I haven't bothered to waste the time to read it, but the title fits in with the way so many people who are brainwashed into the evolutionism belief system will act: Evolution itself becomes a conscious entity; evolution is a substitute for God!
"Look how evolution equipped the gorilla...evolution gradually gave this animal the ability..." and so on, and so on. Not only is it an intelligent force for these people, but, in their faith, they accept it as fact.
Well, my knowledge of laws of the universe is that a law always acts the same way. For instance, when you drop a rock, it always falls down. It doesn't stay put or fall sideways unless there's some unusual circumstance that actively affects it. Capice?
When you look at nature, you see diversity. If evolution was a law of nature, there would be a heckuva lot more consistency. Different animals have different ways of coping or adapting. Some have fantastic eyesight, some detect vibrations, some have tremendous hearing while others are stone deaf.
I think that the Creator also has a sense of humor. The Duck-billed Platypus is hard to classify, so scientists called it a monotreme. It lays eggs, swims, detects electrical impulses, gives milk like a mammal, burrows in the ground — that's one weird beastie!
I have to shorten this up, but you get the jist of it. When I look around, I see holes in evolutionism and plenty of support for Intelligent Design. To believe in evolutionism, I have to suspend my disbelief, my common sense, my learning and my thinking ability. Sorry, guys, I can't accept your faith in the fake god of evolutionism. It's just not consistent. And very inefficient.
My own faith is based on reason and the ability to think, despite what evolutionists claim about it. Now, you can use your own thinking abilities and common sense. Ask questions of the established evolutionary orthodoxy, do research and get the Creationist side of the story.