If I were the adversary I think I'd try to get God's children to fight and compete with each other. No one would be focused on the true enemy. If I could get teammates to try to beat each other, 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.