But how can a being be both omnipotent and omniscient?
If he's omniscient, he knows everything -- including everything that's going to happen before it ever happens. Therefore he can't change it, which makes him not omnipotent. If he were omnipotent, he'd have the power to do anything, including changing the things that he already "knew" were going to happen, which means that what he "knew" was going to happen doesn't actually happen, and therefore he isn't omniscient. It seems to me that, logically, not only can there NOT be a being who is both omnipotent and omniscient, but if a being exists who is omnipotent, it rules out the existence of any OTHER entity who is omniscient, and vice versa.
More specifically related to the OP, if God was omniscient, he knew exactly what Adam and Eve were going to do before he ever created them. And if he was omnipotent, he could have done anything to change this (never mind for a moment the paradox as described above that this would render him non-omniscient.) But either way, he went on and created them and then when they do exactly what he created them knowing they WOULD do, he was furious about it? Saying they were "set up" is a rather polite way of putting it. I'd say more like "f___ed over." Ditto every "sinner" who has lived since; if God knows what we're going to do before he ever creates us and still deliberately and willfully creates us that way, how can we be said to have any agency or responsibility? And what does it say about this deity, if he'd cast his "children" into eternal torment because they did what he created them to do?
Personally I do believe in personal responsibility and all; the part I don't believe in is God. I'm just speaking hypothetically here.