Because they don;t want "a Divine Foot in the door"
Wrong. It's because science cannot function if we include the supernatural. And if you had read the essay you so blatantly quote-mined that statement from, you would understand
why. But just to take a simple example: how do we know aspirin actually works? After all, it
could be that it's just the headache fairy deciding that she likes it when we take aspirin, and at some point it'll stop working because she gets bored of it. This may sound silly, but the fact is that if we allow the supernatural, we must necessarily allow for the possibility of supernatural intervention into everyday means, at which point empiricism, our most useful tool for analyzing reality, completely breaks down. It's like trying to debug a massive program while the code may or may not be spontaneously changing while you try to fix the errors.
You defend naturalism.
But as you can see, it has little to do with evidence, it's 'a priori'.
Are you kidding me? Science grounded in methodological naturalism is perhaps the single most successful system for determining the truth about the universe around us that we have
ever discovered. It has a track record that is absolutely astounding - or are you not reading this on a computer built up of thousands of disparate parts, dependent on multiple fields of science to function? Or maybe a machine you can hold in your pocket that you can use to call your friends, contact people around the world, determine your precise location and draw a map to where you need to go, and look at funny cat pictures on your way home (a home built, reinforced, and insulated using modern scientific advances) from work (a job most likely involving many of these modern scientific advances) on the bus (oh don't even get me
started).
Naturalism
works. The evidence for that is all around you. You think it doesn't? Then perhaps, just maybe, you would be better off abandoning the fruits of naturalism and doing without. Although that's basically impossible, because the fruits of naturalism are the building blocks of modern human civilization.