I am not sure about Muslims or Jews, but a good Christian is a repenting sinner - a man who knows that the struggle between Good and Evil goes inside of his heart.
People who see themselves as good and who divide individuals and nations into good and evil are enemies of the Gospel.
"If only there were evil people somewhere, insidiously committing evil deeds, and it were necessary only to separate them from the rest of us and destroy them. But the line dividing good and evil cuts through the heart of every human being. And who is willing to destroy a piece of his own heart?" (Alexander Solzhenitsyn in Gulag Archipelago)
"This is a faithful saying, and worthy of all acceptation, that Christ Jesus came into the world to save sinners; of whom I am chief." (Saint Paul in his letter to Timothy)
I don't think so. I picture St. Michael, the archangel, with his sword in hand ready for any battle with Satan's best storm troopers. I wouldn't call St. Michael an enemy of the Gospel.