> As a side note, the strange idea that Yahweh is the only "possible" God is taken as granted by religious people,

It's really not, especially by most people who follow non-Yahwistic religions. But even those who personally believe in Yahweh who pose arguments for the existence of a god often do so for a god of a far less defined nature; belief in the existence of a god (however that term is defined) and belief that the god that exists has, in addition to those traits which are reviewed as inherently defining being a god, also has the other traits classically identified with some particular image of Yahweh are often coinciding but distinguishable beliefs.