Proof Mind is Fundamental and Matter Doesn't Exist

[Rational AKD]

"If everything we think we know is false, then some other thing might be true"

I didn't say that... if you're going to make a parody of what I say, you should at least put up the quote you're parodying off of.

You realize that you don't -actually- have to appeal to solipsism in order to make the statement "everything is mind", right?

right, which is why I called this an argument for monistic idealism.

You can make that statement from the position of reductive physicalism just as easily.  You can argue for "the sim" from that position as well, and much, much more competently, I'd wager.

I don't see how you can say matter exists given everything is mind except as a mental construct. could you elaborate?

Particularly in that there's no need to beg from the ledge of possibilities accepted for sake of argument. You can simply provide demonstrations and schematics. "Sims" - as you know them, as you experience them -are- physical things. Little pieces of machinery-in-state.

but 'sims' as you say I call them, don't exist apart from our conscious perception of them in the idealistic model.

Prove for me, right now, that substance dualism is false.....as you so casually claimed had already been proven

it's an acknowledged philosophical problem called the interaction problem. for a substance to be fundamental, it needs to have its own distinct properties and it can't be broken down into smaller parts. substance dualism is the belief mind and matter are two fundamental substances. in order for two substances to interact, they need to share a property. an intangible substance, for example, can't tangibly interact with matter. it needs to share a tangible property to tangibly interact. so if you have two fundamental substances, they couldn't possibly interact. if they share a property, then it must be more fundamental which means one of them is not truly fundamental. if they don't share a property, then they can't interact which means the world we experiences can't come from both substances.
I didn't go in detail on this because typically atheists don't agree with substance dualism anyways. I stress that point when talking to theists, and I stress the refutation of materialism when talking to atheists.