If I were the adversary I think I'd try to get God's children to fight and compete relentlessly with each other. I'd get them to gossip about each other instead of discussing the evil in the world. If I could get them to base their value on looking better than each other, if I could get teammates to try to beat each other's stats, siblings to try to outperform each other, church members to try to out-serve each other, and religious people to constantly compare righteousness, I could probably have my way while they all aimlessly bicker.

Perhaps the key to beating the adversary is simply remembering who the adversary actually is.