Let's start with a definition of "fact." What is a fact? "Facts are the world's data" as Stephen Jay Gould put it. They are things we know, at least as much as we can know something. As Gould put it,
In science, "fact" can only mean "confirmed to such a degree that it would be perverse to withhold provisional assent."
Now think of 10 more facts that we know because of science. Go ahead, I'll wait. It shouldn't take long. Just look at 10 different parts of your body, or 10 objects in your room. Whatever facts we know about them, we know because of science.
Now think of 10 facts that we know because of philosophy. Too hard? OK, think of one fact that we know because of philosophy. Just one thing that we know with great certainty because of philosophy. Did you come up with anything? I couldn't, but maybe you could.
But kuri, you object, science is based on philosophy. It's chock full of philosophical concepts like logic, rationalism, empiricism, etc., and so on. And you're quite correct. Science is based on certain philosophical concepts. But in order for us to actually know anything, to discern any facts about the world, those concepts must be applied in the form of science.
Logic alone won't tell us why the sky looks blue, or why the sea looks blue, or why my eye looks blue, or why a sapphire looks blue. It won't tell us why a rock and a feather fall at the same speed in a vacuum. It won't tell us how old the earth is or what caused it to form.
That's not to say that philosophy is worthless. It gave us logic (which I'm trying to use in this post) and science (which rocks), after all. But what has it done for us lately? Well... there's um... and ... uh... yeah. (Are those crickets?)
Now try to think of 10 things we know because of theology. Now stop laughing. Why even bother? Theology has given us only a mass of confusion. A complex and deeply nuanced mass of confusion, but again, an ultimately trivial one. At least philosophy gave us logic and science. Has theology ever given us one fact about the world or one useful tool for discerning them?
Science, on the other hand, rocks. It rocks because it works. Want to know about something? Use science.
Update: Here's a follow-up post.
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