Well, from my point of view, even ignoring the religious content, I think that the many-worlds interpreation of things, is rather bizzare to say the least. There is nothing in quantum theory which leads irrevocably to "every posibility happens".
All it does is restore determinism to physical theory. This is certainly far from an elegant solution. The 'price' is far too high. It makes far more sense to simply accept randomness as real...or else restore determinism in a much more reasonable manner (Hidden Variables).
Certainly we cannot prove that "every possibility happens" is real...but the evidence for this bizzare claim is incredibly tentative, to say the least.
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