Sorry about the misunderstanding.
Going back, then: it seems that you're arguing against God's omnipotence.
You seem to be arguing that God is training humanity for something (though with no details on what we'd be training for or why, or why we should think that this is the case) and that God is incapable of training us adequately without having us suffer evil and inflict it on others.
Eh... no, forgive me. I must not be good at expressing myself.
A simplification now, of course, but - in a nut-shell - this is what was meant:
The O.P. asked whether the existence of “evil” suggested the non-existence of God, to which I said no, because “evil” is of Man and not of God.
The reason I then gave for “evil” being of Man and not of God, was that “evil” stems from Man’s Ego, which Man has because he’s limited to experiencing life through the perspective of an “individual” (because of Man’s 5 senses, bla, bla, bla (see my original comment)).
To then address why God would not, if so, simply stop Man from using free-will and doing “evil”, I said that sometimes, to give someone the chance to really understand the meaning of something, we must let them experience it first-hand.
Later, as my epistemological views (that we can learn from others, but
understand better from own experience, bla, bla) seemed slightly off topic to the thread, I PM:ed you about that instead.
And so, to your latest - also slightly off topic (apologies to O.P. for this) - question to me, I’d say that it is not that God is “incapable of training us adequately without having us suffer evil and inflict it on others”, but that the
way by which God “trains” Man (I wouldn’t use “train” personally; I’d say “gives Man the opportunity to comprehend the meaning of what is taught”) leads to Ego, misjudgment and sin.
In faith, the faithful here, choose to trust that from that universal “God‘s view” (all-knowing, free from Ego and perspective) that Man does not possess, it is wisely judged that somehow, the insight possible through life is worth the side-effect of Man having to deal with Ego, misjudgement and sin.
I hope I expressed myself less blurry now, but possibly not.
Humbly,
Hermit