The biggest problem with limited knowledge is a presumption that what we don't know therefore doesn't exist. This can lead to the fallacy that Socrates pointed out: thinking to know something when you don't, which is called hubris.
I am generally opposed to most -isms and -ists. I find the work of Howard Bloom very interesting. He calls himself an evolutionist. Behe, on the other hand is a biochemist, I believe. Darwinism is too limiting.