I am prepared to accept that the definition of evil is opposition to a perfect Good whom many including yourself (I think) call God. I realize I’m paraphrasing you here but it’s to relate it back to my post.
I don’t think this means that evil’s existence ceases to be a problem. The problem becomes where does “the will to oppose god” come from? Is it our invention? Did we think it up with our imagination? Does it issue from a rival God like power? Or paradoxically from a perfectly Good God themselves?
“At the end of time all of us may be singing God’s praises regardless of our free will (choice). However, free will (choice) would still mean that at least two possible choices exist - we chose to be there or we were compelled.”
Note I have given God more power here than you seem to have. You seem to suggest that God’s sovereignty is unchallenged due to their capacity to hold us to account for evil choices but that is only power after the fact and only to punish. In such a situation we humans could radically change the end of history by all choosing to go to hell to spite God.
Secondly I raise what God’s sovereignty means to us – that our fate is in God’s hands. This is at stake if evil is a choice. If we believe God has ceded control to human choice even if only temporarily then our position is experientially no different to someone who doesn’t believe in God. Good/God is absent and cannot be relied upon to save us.
Now the other bold claim I make is to say that even just calling Good essentially logical (or common sense) is to put non-theists in the same predicament as theists re: the problem of evil. It is perhaps wrong to say that this leaves them with only moral subjectivity as a solution. I could possibly come up with as many varied answers as I did for theists.
However it is precisely the realization that it is possible for educated, well fed, church going citizens to stand in the midst of a nazi crowd and call it good that caused Western philosophy to acknowledge the terrible truth of moral subjectivity. What was even more heartbreaking for atheistic left wing intellectuals were the horrors of Stalinism. Nobody wants to believe that their moral opinions are the consequence of their crowd but it’s historically evident that they can be. This is why I continue to plead for empathy over any moral system of statements about what is true evil.
Basically Simon I agree you stand on firmer ground when you believe that moral statements are discoverable facts. It allows you to "know" that all manner of things are either right or wrong. Perhaps you even feel that matters of degree such as how much we give to charity or spend on our luxuries have a morality that is a discoverable fact as well. It certainly indulges our instincts to feel that way. The alternative is a self-questioning shaky ground.
As you rightly point out it is a place with many problems…to quote you;
“…Why fight evil if it doesn’t really exist? Why do I feel that evil and right and wrong does exist if it is just an illusion? Am I comfortable with the idea that my concept of evil may just as well be good in a different time or place or culture? If there is no God then where is there any hope that evil will not win? If there is no God where is there any hope that evil will one day be fully dealt with?”
Once we see that our moral objectivity may just be a tempting illusion that’s exactly the rough road ahead .