That's a great point. I do think, however, that the Goldilocks Enigma is a somewhat different case because none of the competing theories are currently any more testable than God is. The multiverse theory may be more scientifically compelling, but is boasts just as little evidence (as far as I know). I've also heard some wild quantum explanations about how the universe exists in a superposition that collapses into an observable state with the "just right" constants when we observe it, a la Schrodinger's Cat.