Not specifically, no; more like we have given over formlessness to God, as forms are known/knowable. It is an image of God as imageless, a form of God as formlessness, a definition of God as undefined, all of which defy explanation (they don't explain anything).
I see what you are saying in the first bit, and I agree that claiming God as the formlessness linguistically eliminates God as the form; but ironically, as I see it, I can only see (metaphor) what you are saying because I have that foundation of understanding the formlessness in place, and in understanding duality I can draw on unity, drawing it all back together like a rubber band, so that when it is said that "God is the unknowable" it is an implicit acknolwledgement that the formless is also every form that we can give it, and that describes something both greater than/lesser of and co-existing with and as God --me. The force that brings order from chaos, figuratively speaking, is imagination.
I can't address the Abrahamic stuff, sorry, don't know enough about that.