Regarding "why care" about something: I had a period where I didn't quite let go of my god beliefs based entirely on emotional-type thinking. It would not have changed me much to remain in that hazy place and presume that I was a deist. But I don't think I'd have been happy if I didn't scratch that particular itch. I think that skepticism works against the way our minds want to work. But sometimes we need to scratch that itch.
"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