Suppose we define a 'generic theist' as one who affirms the existence of a bodiless person, a pure spirit, who is omnipotent, omniscient, and omnibenevolent, and who in addition is perfectly free, the creator and sustainer of the universe, and the source of moral obligation. This generic theism is common to the mainstream of the three Abrahamic religions. Most theists, however, are not 'generic' but adopt a specific form of theism. Christians, for example, add to the divine attributes listed above the attribute of being triune and others besides. Christianity also includes doctrines about the human being and his ultimate destiny in an afterlife. Generic theism is thus an abstraction from the concrete specific theisms that people accept and live.
Now the point I want to make is that, just as we ought to distinguish between generic theism and specific theisms, we ought to distinguish between the generic problem of evil and specific problems of evil. The generic problem of evil is the problem faced by the generic theist of reconciling his belief in a God possessing the standard omni-attributes with the existence of evil in the kinds and amounts encountered in the actual world. A specific problem of evil, on the other hand, is the problem a specific type of theist has in reconciling the existence of God with the existence of evil.
We need to examine whether the problem a theist of a specific stripe has in reconciling God and evil is easier to solve or perhaps harder to solve than the problem a generic theist has.
To see what I am driving at, imagine a version of theism — call it version A — that affirms God, immortal souls, and the eventual blissful communion of all souls with God. On this version of theism there is purgatory, but no hell defined as a state of everlasting separation from communion with God. Thus on this version of theism there is post-mortem evil, the pain of purgatory, but this purgatorial evil is instrumental for the achieving of a higher good and is to that extent redeemed by this higher good.
Now compare this theism-A with a theism-B which affirms God but denies post-mortem existence whether in the form of immortal souls or in the form of resurrected bodies. On this alternative the God of the generic theist (defined above) exists, but for human beings this life is all there is: at death a human being ceases to exist utterly. Now does it not seem that the theist-B faces a much tougher problem than the theist-A when it comes to reconciling a good God with the fact of evil?
For the theist-B, the horrendous evils of this life are not compensated for by any life to come. But for the theist-A, the transient evils of this short life are as nothing compared to the endless bliss of the soul's communion with God and with other purified souls. Thus gratuitous evil for the theist-A is a vanishing quantity.
Most atheists share the very strong intuition that the probability of this world's containing the amount of evil it does is much greater on the hypothesis that God does not exist than it is on the hypothesis that God exists:
Prob(E/~G) >> Prob(E/G).
But to properly evaluate this inequality, how can one leave out the rest of what most theists believe? The amount and kinds of evil in this world enters the calculation, no doubt. But the absence of gratuitous evil, and the presence of unending bliss in the next world, are also relevant if the question concerns reconciling God and evil within theism-A.
To sum up:
1. Real live theists are not generic theists, but theists of some particular stripe or other. Generic theism is an abstraction.
2. The problem of evil, if it is to be a genuine existential conundrum and not a mere logic puzzle, is the problem of reconciling the existence of the God of a particular religion with the fact of evil as evil is understood from within this religion.
3. A theism that affirms God, post-mortem existence, and the eventual unending blissful communion of all souls (or resurrected persons) with God does not face the same problem of evil as a version of theism which denies post-mortem existence.
4. It is dialectically unfair for atheists to argue against all (classical) theists from the fact of the evil in this world when (i) not all theists are generic theists, and (ii) some theists believe that the transient evils of this short life are far outweighed by the unending bliss of the world to come.
5. It is arguable that there is no insoluble problem of evil for theists-A. Suppose this world is a vale of soul-making in which human beings, exercising free will, make themselves worthy, or fail to make themselves worthy, of communion with God. Combine this soul-making idea with post-mortem existence, and the existence of purgatory but not hell, and we have perhaps the elements of a solution to the problem of evil. (Cf. John Hick, Evil and the God of Love, Part IV)
Let me conclude by noting that a theism-C which holds to eternal damnation for some may exacerbate the problem of evil. Here I refer you to David Lewis' posthumous "Divine Evil" in Louise Antony, ed., Philosophers Without Gods, Oxford 2007, pp. 231-242. Lewis, may God rest his soul, maintains that the usual logical and evidential arguments from evil are a "sideshow" compared to a "simpler argument, one that has been strangely neglected" (p. 231) that focuses not on the evils that God fails to prevent, but on the one's he perpetrates. And then he goes on to speak of hell and eternal torment. You can guess what conclusion he comes to.
We shall have to examine Lewis' simpler argument from evil in a separate post. But I am happy that he in effect concedes one of my points, namely, that a serious discussion of the problem of evil must address the whole of a theistic position and not focus merely on God and his attributes.