I guess I made it sound like it's wrong to have faith in anything. That wasn't my intention. It's perfectly okay to have faith in something as long as you don't wilfully ignore the evidence.

So it's okay for you to take quantum mechanics on faith - as long as you don't try to argue whether or not it accurately describes the way the universe works. And if you want to argue that the laws of motion from classical mechanics are correct, then you must understand the evidence that caused us to revise those laws in the first place.

The question is "why are humans here?" Creationists choose to put faith in religious texts which say that we're here because an omnipotent being put us here. Some people put faith in scientists who say that we're here because we evolved from monkeys (to simplify it somewhat). None of these people can say they are informed on the subject, and there's nothing wrong with that.

However, some creationists choose to argue with those who have considered the evidence and choose to believe in evolution because they think it fits the evidence better (ie. most scientists), even though those creationists refuse to consider the same evidence. That's what's wrong - not accepting something on faith, but arguing with those who are going on more than just faith.