But it is God who ordained sin, unless things happen contrary to his will. And if it was part of his will, then it is his doing, because the world is either exactly as he wills it or he is no sovereign lord over this world.
The appeal to the "machines" argument may be an attractive way to let God "off the hook", but then if God wants "all men saved" and no one will sin in heaven then we must assume that he really wanted us that way, namely mindless machines who only do his will.
For why would God create man innocent and pure only to let him fall so he can then save him as such a price so that he can be innocent and pure once again?!?
If God were to stamp out evil today, he would do a complete job. His action would have to include our lies and personal impurities, our lack of love, and our failure to do good. Suppose God were to decree that at midnight tonight all evil would be removed from the universe – who of us would still be here after midnight?
Well, the short answer is: all the people for whom Christ died and who believe.
I must say, at first your argument seems quite good. As is the case whenever this same argument is used, whether the language is straightforward or whether its nuance slides, as a serpent would hide slithering, among dying, moss covered logpiles. But poke it, just a feather-light touch at the ground beneath, and the whole thing comes crashing to bits.
Your premise, that you can judge God’s will because you meet the necessary criteria of knowing and understanding it fully, is false. So your argument doesn’t hold.