I've probably posted about this before. But christians have never really answered this. Accordintg to christian beliefs, does "Satan" have free will? This is especially significant in light of the predictions of Revelation. Assuming, for the sake of argument, that "Satan" exists, he is certainly aware of the predictions. Given his supposed hatred of the nameless god, he could simply refuse to play the role set for him. Alternately, christians might believe that "Satan" is no more than a puppet who cannot help but play the role. But, in that case, it is really the biblical god who "leads people astray."
Now, it has been nearly two thousand years. Some people will, no doubt, say that means there was no supernatural force behind the bible. I cannot rule that out. However, it would appear that, if a supernatural entity inpired the bible, the fellow tagged as "Satan" has, indeed, refused to play his role. And, quite frankly, I don't blame him.