For many centuries, philosophers have debated this question: ‘Does God exist?’ Surprisingly, they have paid rather less attention to this distinct – but also very important – question: ‘Would God's existence be a good thing?’ The latter is an axiological question about the difference in value that God's existence would make (or does make) in the actual world. Perhaps the most natural position to take, whether or not one believes in God, is to hold that it would be a very good thing if such a being were to exist. After all, God is traditionally thought to be perfectly powerful and good, and it might seem obvious that such a being's existence would make things better than they would otherwise be. But this judgment has been contested: some philosophers have held that God's existence would make things worse, and that, on this basis, one can reasonably prefer God's non-existence. We first distinguish a wide array of axiological positions concerning the value of God's existence which might be held by theists, atheists, and agnostics alike. We next construe these positions as comparative judgments about the axiological status of various possible worlds. We then criticize an important recent attempt to show that God's existence would make things worse, in various ways, than they would otherwise be.

God is traditionally taken to be a perfect being, and the creator and sustainer of all that is. So, if theism is true, what sort of world should we expect? To answer this question, we need an account of the array of possible worlds from which God is said to choose. It seems that either there is (a) exactly one best possible world; or (b) more than one unsurpassable world; or (c) an infinite hierarchy of increasingly better worlds. Influential arguments for atheism have been advanced on each hierarchy, and these jointly comprise a daunting trilemma for theism. In this paper, I argue that if theism is true, we should expect the actual world to be a multiverse comprised of all and only those universes which are worthy of creation and sustenance. I further argue that this multiverse is the unique best of all possible worlds. Finally, I explain how his unconventional view bears on the trilemma for theism.

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God is traditionally understood to be a perfect being who is the creator and sustainer of all that is. God's creative and sustaining activity is often thought to involve choosing a possible world for actualization. It is generally said that either there is (a) exactly one best of all possible worlds, or there are (b) infinitely many increasingly better worlds, or else there are (c) infinitely many unsurpassable worlds within God's power to actualize. On each view, critics have offered arguments for atheism that turn on God's choice of a world. In what follows, I first discuss some background issues, and I then survey the contemporary literature on these arguments.

Defenders and critics of the evidential argument from evil typically agree that if theism is true, no gratuitous evil occurs. But Peter van Inwagen has challenged this orthodoxy by urging that for all we know, given God's goals, it is impossible for God to prevent all gratuitous evil, in which case God is not required do so. If van Inwagen is right, the evidential argument from evil fails. After setting out this striking and innovative move, I examine three responses found in the literature, and show that none of them defeats van Inwagen's argument. I then offer a novel criticism: I show that van Inwagen implicitly relies on the claim that God can sensibly be thought to satisfice, and I argue that this is seriously under-motivated. Accordingly, van Inwagen's objection to the evidential argument from evil is, at best, incomplete.

Theism is the view that God exists; naturalism is the view that there are no supernatural beings, processes, mechanisms, or forces. This Element explores whether things are better, worse, or neither on theism relative to naturalism. It introduces readers to the central philosophical issues that bear on this question, and it distinguishes a wide range of ways it can be answered. It critically examines four views, three of which hold (in various ways) that things are better on theism than on naturalism, and one of which holds just the opposite.

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