Human evil is created by er, humans, Stranger.
Your sticking point seems to be not believing in free will/not having a sense of personal responsibility. Is God responsible for the evolution of beings capable of alienating themselves from him Yes. Is God responsible for the actual alienation..................
My sticking point is logic. If god is both omniscient and omnipotent and it created everything, then it either, at that instant, fixed the entire history of everything, including all human choices, or it introduced some genuinely random element. In either case, it is fully responsible for everything.
This was discussed at great length earlier in this thread - logically, every event is either produced deterministically or it has some element of true randomness. There is no logical 'get out' for 'free will'.
From a human point of view, such a perspective is pretty much useless and, for all practical purposes, we can assume we have 'free will' in the
compatibilist sense - but an omniscient, omnipotent creator would unavoidably be responsible for everything.
Even if we were to ignore that glaring logical hole in (most versions of) Christianity - the notion that all humans are "sinners" implies a 100% failure rate - that couldn't be a genuine human choice, it would have to be a design flaw.