I think that those who identify as Biblical Christians are differentiating themselves from organized religion and the idea that you should get your beliefs from the pulpit. Which is not an irrational idea; if the Bible is god's word to mankind, then why wouldn't anyone be able to read it and figure it out? This is complicated somewhat by the tens of thousands of ways that it gets interpreted, but that's not a problem if you don't think it was written (or inspired) by god.
"Well, evolution is a theory. It is also a fact. And facts and theories are different things, not rungs in a hierarchy of increasing certainty. Facts are the world's data. Theories are structures of ideas that explain and interpret facts. Facts don't go away when scientists debate rival theories to explain them. Einstein's theory of gravitation replaced Newton's in this century, but apples didn't suspend themselves in midair, pending the outcome. And humans evolved from ape- like ancestors whether they did so by Darwin's proposed mechanism or by some other yet to be discovered."
-Stephen Jay Gould
-Stephen Jay Gould
