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Free Will and The Problem of Evil
Religion threads are always amusing, so I thought I'd give everyone something to chew on. 
For those not familiar, the Problem of Evil is a logical argument for the nonexistence of any omnipotent, omniscient, and omnibenevolent God.
The form of the argument is quite simple:
1. If God is omniscient, then he is aware of the existence of evil.
2. If God is omnipotent, then he is able to prevent the existence of evil.
3. If God is omnibenevolent, then he desires to prevent the existence of evil.
4. Evil exists.
5. An omniscient, omnipotent, omnibenevolent God does not exist.
Apologists' attempted refutations vary, but the two most common seem to be the greater good argument and the free will argument.
The greater good argument suggests that events that appear to be manifestations of evil or suffering are ultimately beneficial, as they are part of God's "plan." As is hopefully obvious, it is an absurd attempt which fails to recognize the scope of omnipotence. An omnipotent God can, by definition, do anything. Therefore, he can bestow upon us whatever benefits we might gain through the existence of evil or suffering instantaneously without the need for such an intermediary step.
The free will argument is much more popular among those educated on the issue. It was popularized by a modern philosopher by the name of Alvin Plantinga and, much to my befuddlement, has been accepted as a sufficient refutation of the problem of evil by most experts in the philosophy of religion.
The argument supposes that "free will" is a good characteristic for the universe to have. Therefore, since God is omnibenevolent, he must include free will into the universe he created. However, granting humans free will allows them to make evil choices, resulting in the existence of evil.
There are a number of glaring problems with this argument as well, however, which leaves me puzzled as to why it has gained such a degree acceptance even among many atheists. First of all, it completely fails to account for evil or suffering of non-human origin. Unless one supposes, for example, that somehow all diseases and natural disasters are the product of human free will, then the argument fails to explain the existence of some evil which can still be shown to exist, and God is incompatible with this evil. Given the absurdity of such a supposition, this argument is obviously very weak - but perhaps it would at least leave the slightest room for doubt about the nonexistence of God.
Upon further inspection, however, it is evident that the notion of "free will" to begin with is simply a red herring. Plantinga assumes that "free will" necessarily includes the ability to choose evil. However, God has already placed arbitrary restrictions on the decisions we can and do make by manipulating human nature, and limiting our physical and cognitive capabilities. There is no logically necessary reason why God could not have eliminated evil caused by humans by creating us such that we were either unable to grasp the idea of doing evil or by changing the physical reality of the universe so that we couldn't carry out evil choices (for example, making it impossible for humans to kill one another).
In either case, God has prohibited some arbitrary set of actions from the scope of our "free will." The only difference is that in once scenario, evil does not exist. There is no logical obstacle to prevent God from having created the "evil-free" universe rather than the existing universe. If he was omnibenevolent, he would have opted for the same "quasi-free will" which we presently possess, but without evil. Since evil exists, he obviously didn't. Therefore, the aforementioned God still can not exist according to the problem of evil.
Is Plantinga's argument a failure, or am I wrong? Where does the problem of evil leave this God which so many people want so desperately to believe in?
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