Logical priority, broadly defined, is the way things are ontologically ordered. That is, to say that for two factors, x and y, x is logically prior to y if and only if x takes precedence over y. An example could be to use miracles and God (note this is just for the sake of example, I realize that some would argue miracles can exist without God, but I’m simply using it as an illustration). The existence of God is logically prior to miracles in the sense that if God does not exist, then miracles do not. In this case, God would be x, while miracles would be y. In order for y to be the case, x must also be the case, thus making x logically prior to y.
So what does this have to do with God? Very much, I would say. For one of the most common objections to the existence of God is that there is no (or not enough) scientific evidence to demonstrate God’s existence. I have addressed such objections before, but now I would like to take a completely different approach. That is, I believe that the existence of God is logically prior to the question of scientific evidence.
The reason I take the existence of God to be logically prior to scientific evidence is be cause logic is prior to science. Take the case of necessity, for example, and combine it with the case of scientific laws. Now, in science, a law is generally something like “if x occurs, then y will occur.” But it is not the case that such laws operate on a logically necessary level. For it is not the case that “Necessarily, If x occurs, then y will occur” (or, □(x⊃y) for those who enjoy ‘logic-ese’). It is simply the case that this is what happens in all observed cases. It could even (possibly, but not modally) be said that “If x occurs, then, necessarily y will occur” (again, logic-ese: x⊃□y), but this does not establish logical necessity in the modal and broader sense.
The type of necessity which can therefore be ascribed to scientific laws is a contingent or “accidental” necessity. They operate in a necessary sense in that in this world (out of all possible worlds) it is the case that if x then y, but they do not operate necessarily in the sense that in every possible worlds it is the case that “if x then y.”
Logical necessity, however, is prior to this. For, on logical necessity, that which is necessary is necessary in all possible worlds. Logical necessity is the very thing which scientific necessity lacks.
Again, we may ask, what does this have to do with God? Well, if it is the case that it can be demonstrated that God exists out of logical necessity, then the question of scientific evidence is irrelevant. For logical necessity is prior to scientific necessity. This is not to say that scientific evidence is not useful when exploring the “God question”, if you will, but it is to say that if it can be demonstrated that God is logically necessary, then demands for scientific evidence to demonstrate or even make probable the existence of God are misplaced. For if God is logically necessary, then to deny the existence of God is incoherent in the strong sense (that is, it is illogical). The logical demonstration would be prior to and therefore supersede the scientific evidence or lack thereof (I believe that there are at least some reasons scientifically to believe God exists, but that is off topic).
But then, we must ask, can it be demonstrated that God is logically necessary? Well yes, I believe so. I have argued this at length elsewhere, so I won’t reiterate it (see here). If any of these arguments are sound (as I believe they are), then the question of scientific evidence for God’s existence is simply a non-factor. Certainly, the scientific (and other) evidences may be seen as providing further justification for believing that God exists, but if it is the case that the arguments for God’s logical necessity are sound, then such arguments are the only tools needed to defend the claim that God exists. Further, to dispute such a claim (that is, God’s existence) would be incoherent in the strongest possible sense.
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