One contemporary response is that possibly "there has been an evolution of worlds (in the sense of whole universes) and the world we find ourselves in is simply one among countless others that have existed throughout all eternity." And given infinitely many universes, Daniel Dennett thinks, all the possible distributions of values over the cosmological constants would have been tried out (p. 179); as it happens, we find ourselves, naturally enough, in one of those universes where the constants are such as to allow the development of intelligent life. But then the probability of theism, given the whole array of worlds, isn't particularly high.
In the same way, then, a theist might agree that it is unlikely, given just what we know about our world, that there is such a person as God. But perhaps God has created countless worlds, in fact, all the worlds (all the universes) in which there is a substantial overall balance of good over evil. In some of these worlds there is no suffering and evil; in some a good deal; as it happens, we find ourselves in one of the worlds where there is a good deal. But the probability of theism, given the whole ensemble of worlds, isn't particularly low.
I suppose one could argue that it's ad hoc to propose a multiverse in order to deal with the problem of evil, but I don't see how it's any less ad hoc than proposing it to account for the anthropic coincidences.
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