Calling something a theory does not make it a theory. Theories must have evidence. What evidence supports materialism? It is a only blanket assertion that matter is all there is.
Somehow I doubt that materialism is “only [a] blanket assertion that matter is all there is.” I imagine David Armstrong fit a few other words in
the remaining 400 pages.
If I said evolution happened and that is my theory, but offered no evidence, you would repudiate that as a theory, no?
Actually, probably not. A theory with no evidence to support it just seems like a bad theory to me.
So what is the evidence that matter is all there is?
Well, here is another issue: There is matter. What the materialist does is claim that matter is
sufficient for explaining everything that is observed. He argues that his theory is explanatorily sufficient and simpler than alternatives which posit more entities. There is evidence that matter exists, and if he does not need other entities to account for mind (say) then he has an argument for materialism.
He doesn’t need evidence that matter is all there is if he can make the simplicity claim, anymore than you don’t need evidence to prove that you have one soul and not two.
It is a philosophical presumption largely based on an atheistic premise. That is not proof. You may if you like call it a perverse use of Occam’s Razor, but Occam himself would never have allowed that becasue atheism is not science, and materialism is not science. Both are philosophies and poor ones at that.
I agree that atheism and materialism are philosophies. I also believe that they are both false.
My concern is that you do not take your intellectual opponents seriously. I hate to break it to you, but materialism (in all of its various forms) is the dominant position in contemporary philosophy of mind, and contemporary philosophers of mind, I must admit (though I don’t agree with them), are not stupid. Most contemporary philosophers of mind regard themselves as being “beyond theism”–they are atheists, but it does not constitute a particularly significant component of the way they do philosophy, because they regard atheism as obvious. (Searle, Nagel and Tallis have all made comments to this effect, despite being some of the naturalists who tend to go against the more strongly materialist stream.) The problem I have is that if someone comes on this forum, with materialist sympathies, it is unlikely that they will find your arguments against materialism cogent.
Claiming that materialism has an atheistic premise is not an effective way of arguing against it.
The principle of parsimony, ie. Occam’s razor, has almost nothing to do with Occam himself. It has been employed by virtually all philosophers because it is a sound epistemic principle. It does not presuppose theism. It is not limited to scientific application.