I'm not sure how "God exists" follows from "We use a technical term to describe a possible attribute of God." I mean, I don't actually believe in divine simplicity. But I suspect this is a tangent.
No, possible worlds aren't like alternate realities, though that's the easiest analogy. For most philosophers, with my apologies to the Australians, talk of possible worlds is merely a heuristic device.
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"Die Deutschen meinen, daß die Kraft sich in Härte und Grausamkeit offenbaren müsse, sie unterwerfen sich dann gerne und mit Bewunderung:[...]. Daß es Kraft giebt in der Milde und Stille, das glauben sie nicht leicht."
"The Germans believe that power must reveal itself in hardness and cruelty and then submit themselves gladly and with admiration[...]. They do not believe readily that there is power in meekness and calm."
-- Friedrich Nietzsche
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