Antitheism

[Excited Penguin]

At least their God can be described, the deistic God is nothing but a half-baked unprovable and unfalsifiable concept that is by its very definition unknowable, thus meaningless.

I'd wager that the Abrahamic god is also unprovable and unfalsifiable. At least, that's how his followers behave.

Also, some forms of deism subscribe to the belief that the Universe itself is god. That idea has meaning too, even if it is unknowable or unfalsifiable.

(Emphasis mine.)
Yep. Except I wasn't talking about the Abrahamic God in particular. All beliefs in god are unprovable and unfalsifiable, as they are presented to us(I shouldn't have to add this caveat, it should be obvious). But a theistic God(no matter from which religion it is) insofar as it is purported to relate to the universe in any meaningful way holds some real meaning, even though said meaning is terribly misplaced and thus misleading. A deistic God purports something to exist that, by its very definition, doesn't. So it's a contradiction in terms. 

Also, some forms of deism subscribe to the belief that the Universe itself is god. That idea has meaning too, even if it is unknowable or unfalsifiable.

All forms of belief in a creating God imply that the Universe is God. Few of them explicitly say so.

This belief is meaningless in itself. It is a misuse of language to call something else the Universe and claim that that is somehow its own thing at the same time. The universe is all there is.

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Just because certain ideas exist, doesn't mean they make any sense.