Does God exist: A hopefully civil and fruitful debate

@your edit: that's easy, then. Omniscience and omnipotence are mutually contradictory, in addition to each of them contradicting the known laws of physics (and if you're going to start arguing that God might exist outside said laws of physics, outside time and causality - then what exactly can we base our "rational discussion" on? What facts can be agreed upon, that we can derive any conclusions from?).

As for (omni)benevolence, that requires further definition.