In reality, Satan's agents serve to distort the truth of the grace and knowledge of Jesus Christ. It is his genius plan to counterfeit the divine good produced in God's plan. Satan's plan, the improvement of this world and of human condition, etc., is secured through the human good that God Himself rejects. In reality, what Satan puts to use is God's rejection, but hey, it works for him. And, it works for people too.
People love to feel that they are doing their part, and inserting their portion.
It is antithetical to God's grace policy but it sure pleases the old sin nature. In God's plan the believer operates in his new nature, and in divine power. That is the only avenue to the production of divine good. In Satan's world system as we know it, man operates in his flesh, his old man, i.e., the old sin nature. And the reason it feels so right is because the flesh loves that which the flesh produces.