"ignoring the fact that you just said that omnipotence doesn't mean omnipotence"
Well, that's not how theologians define omnipotence. And typically the person making a statement with a word gets to say what he means by the word, within reason. But if you're insistent, and "omnipotent" to you entails being able to do the logically impossible, then by all means, I apologize -- by that definition, God is not omnipotent.
"For example, teaching a child a lesson should be possible for an omnipotent being without forcing him to crash his bike and skin his knee."
Why? Would the lesson really be taught? He could, I suppose, just implant the skill in the child's brain, but then, that might cause the child to take a very wrong view of how the world should work, and to become lazy. Typically, muscle memory and such involve trying something before you actually know how to do it, and trying something like bike riding before you know how to do it involves falling. Now, He could _no doubt_ hold the bike up miraculously when the child "fell." I think there's an argument to be made about whether the child would learn the lesson in that case, but the real point then is -- hey, it was an analogy, and it was the parent, not God, in the bike riding story. There are other things -- like learning empathy -- that are probably impossible without suffering. (They're also unnecessary without suffering, of course, but there's a definite argument to be made that things like love can be deeper in somebody who is capable of empathy).
"Furthermore, God supposedly created this world. Why did he do it in such a way as to make suffering the method of achieving good things?"
And that, you see, is exactly the kind of question where God tells Job, "You're past your depth." And clearly we are. We have no grasp on the space of possible created worlds. It's a great question, of course, and it's fun to discuss, but the point is, it remains unanswerable due to our ignorance, and absent being able to give it a definitive answer, Epicurus's argument fails. For it to succeed, we would need to know that there was a better world that did not have suffering. That is far beyond our ken.
"Second, you're ignoring the point that Jamie's medical condition is in no way accomplishing any good for anyone."
And you are begging a question.
"The fact that you accuse the statement on depending on a faulty assumption while at the same time believing in a God only because you believe there is a God is extremely foolish. "
I don't know what this means.