Ah, the old, 'kids in the sandbox' explanation for how monotheism got started:
"My god is better than your god."
"He is not. My god is more powerful than anything in this world."
"Oh, yeah? My god made the world."
"Whatever. My god made everything. Including your god, who's really just an errand boy."
"My god is better than your god."
"He is not. My god is more powerful than anything in this world."
"Oh, yeah? My god made the world."
"Whatever. My god made everything. Including your god, who's really just an errand boy."