A "meta-argument" against all future arguments for God's existence ?

[Belacqua]

Numbers are non-material objects, languages are non-material objects, so are names, designs, emotions, music, literature, paintings, software.

Non-material objects have no effect on reality since they don’t exist.

Everything you list here has obvious effects on reality. Language, for example, structures how we think, and how we think affects what we do, and what we do is our reality. 

And I asked:
So, what lead these people to claim that a god is absolutely simple?
What do they mean by absolutely simple. What are its properties?

Did you look at the Stanford Encyclopedia link? This is Theology 101.