Let me play a bit of Devil's Advocate here. A compelling argument could be made that all actions & forces in the universe are really, all the same thing, just wearing different clothes for different situations. Everything is just energy(as in literal energy not the hippie-mystical-bull**** 'energy') being moved around and converted. From that perspective, I think you could reason that because of that, a singular deity is the most likely conclusion, because in the end everything just circles back.For me, I have trouble coming to grips with the opposite: how in the world can there be only one when scientifically speaking, this is a universe of multiple physical forces working together?
Clearly, I'm on the polytheist side, but there are certain perspectives I'm happy to grant as being compelling for the case of a sole deity.