It does not take much to demonstrate the impossibility of many gods. The bigger a god is, the more of the universe its devotees claim is within its sway, the more improbable its powers have to be to make what we do know about the universe compatible with its existence. A river spirit or trickster that hides your socks when no one is looking has a small effect on reality, and can hide in the statistical noise that keeps our world de facto unpredictable. A huge god, though, needs to be simultaneously of massive import, so that its influence permeates many facets and phenomena in the world, and utterly minuscule, so that it has an excuse for when it inevitably doesn’t show. Thus, we get gods defined as controlling the weather, the course of wars, and whether anyone lives or dies, but whose influence is indistinguishable from the sum of the hundred and one worldly factors in and causes of all of these events; gods who can be expelled from their controlling niche by humans having the temerity to document and measure, as if God were mere quantum uncertainty; gods who use mortal movers as their proxies, merely shifting the problem one layer of agents upward with theological sleight of hand.
Christianity, between its native Abrahamic grandiosity and its wholesale lifting of neo-Platonic idealism, offers some of the largest gods. Many versions of Christianity have gods so massive that they not only inflict weather events on people totally unrelated to whatever ostensibly displeased them, but they also, the soothsayers tell us, transcend time and space. This god, even Jewish dreamers like to claim, exists outside of and independent of time, such that past, present, and future are all the same to it. Events at any point in the universe’s progress are like the pages in a book this creature is reading, and flipping backward or forward is as easy for it as the analogy implies. It created the universe and now sits outside it, a cosmic voyeur that may or may not ever interfere with unfolding events, depending on the version.
It will not surprise my readers, I am sure, to learn that this god is incoherent with both logic and the facts of our universe.