30 Dec '07 09:46>
Aquinas argued that if the Incarnation did not really happen, then an even more unbelievable miracle happened: the conversion of the world by the biggest lie in history and the moral transformation of lives into unselfishness, detachment from worldly pleasures and radically new heights of holiness by a mere myth.
As has already been pointed out, Christianity need not have come into being as a conspiratorial lie, but rather as a shared illusion.
Nonetheless, one general argument marshalled in favor of Christianity seems to be that, unless Christianity were true, it could not possibly have come into being, either because it has consistently provoked extremely positive effects (e.g., the moral transformation of grevious sinners) that would be otherwise inexplicable, or because it has consistently provoked extremely potent effects (e.g., the conversions of multitudes) that would be otherwise inexplicable; or both.
However, this general argument strikes me as immediately vulnerable to obvious objections.
First, it is questionable whether or not the effects of Christianity have been extremely positive. I concede that they have been extremely positive on occasion (e.g., the life of St. Francis). However, it must also be conceded that the effects of Christianity have, on occasion, been extremely negative too (e.g., the Crusades). At the very least, it would be tendentious to claim that the effects of Christianity have been *uniformly* extremely positive. There is balance sheet to be considered, even if the precise balance can be debated.
Second, it is questionable whether or not the effects of Christianity have been extremely potent. To assert that Christianity has consistently provoked potent effects (and in particular, positive ones) is to make a strong causal claim about it (even if the claim is both complex and vague: is the ultimate agent of causation God or Jesus, Christian men and women, or some combination thereof?). But to make that claim is to assert that no other natural forces or combination of natural forces could possibly suffice to bring about these effects. How sure can anyone be of this? Surely, it is a species of argument from ignorance merely to declare this. Can anyone be certain that there is not in human nature, independent of God, the potential for Christianity to emerge as a collective illusion? Do we know enough of human nature to exclude this possibility? I submit that it would be presumptuous to assume as much. Indeed, there is plenty of collateral evidence that human being are capable of imagining any number of impossible things before breakfast, of misunderstanding the causes of their psychological states, of tending to acquire belief in disincarnate spirits, of linking morality to such beliefs, etc.
(Aside 1: Suppose we concede that the effects of Christianity are inexplicably potent naturalistically, but note that they are not uniformly positive. Would that count as evidence for or against Christianity being true?)
(Aside 2: Suppose an alternative religion to Christianity--like Buddhism, Hinduism, or Islam--also had extremely potent and good effects, verging on the otherwise inexplicable, at least according to the intuitions of some. By the same argument, these effects would suggest these religions were true. However, there exist, at the very least, substantial incompatibilities between the tenets of these different religions and Christianity, and indeed, between the tenets of these different religions themselves. How are these incompatibilities to be resolved? Or suppose that Islam gained ground, and Christianity lost it, in terms of numbers. Would that imply that the true values associated with the propositions asserted by one religion or the other would switch?)
Third, there is a strong Darwinian-style argument against the arguments for potency and positivity adduced in favor of Christianity. Suppose, over the course of history, you had N number of self-styled gurus. These would then arguably exhibit a (possibly skewed) Gaussian distribution of success in attaining converts. A few, perhaps the least charismatic with the least receptive audiences, would give up after a week; most would exhibit a degree of success due to their native talents and the enthusiasm of followers, but still only sufficient to found an evanscent cult; but a few, in the positive tail of the distribution, would manage to found a major world religion, because the other manifold conditions necessary for it to take permanent root would be, out of sheer luck, present. So basically, Christianity struck it lucky. There were lots of other losers in the religion race, but we never hear from them, because they are lost in the sands of time. Hence, it isn't the case that the intrinsic merits of Christianity are entirely responsible for whatever potent and positive effects can be justly attributed to it, but rather also, and probably to a huge and unappreciated extent, that the extrinsic conditions were ripe for its emergence, conditions that might have favored another religion, but that happened to favor Christianity.