The carnal mind is hostile to God and subsequently to one's neighbor. Because Satan's spirit is hostile to law, all who bear his image are hostile to law, breaking laws, taking advantage of each other. They are self-centered just like Satan, interested only in the protection and the increase of themselves.
Here is the basic drive of that spirit, its heart and core: overweening pride. Remember, Satan is "the king of pride." Overweening pride reveals itself in hostility, animosity, hatred, malice, deceit, anger, cunning, competition, resentment, bitterness, self-pity, and intellectual vanity. Every one of these attributes divides people against each other.
Consider how that spirit divided the Jews from Jesus. That spirit eventually led them to divide to the ultimate: They murdered Him. They took His life, defending themselves from the truth that He was preaching to them. The animosity, the hostility to God has never been shown more clearly in the Jews' relationship with Jesus Christ. What God tells us is we have the same spirit as those people. We have been marked.
This is only a partial list of this mark, a partial list of the spirit that emanates from Satan. All we have to do to add to the list is to think of those attitudes that drove Satan to persuade one-third of the angels, organize them, and then lead them into war against God, and we will discover the elements of that spirit emanating from the Beast and marking men.
Have we ever felt any of these attitudes toward some of our brethren in the church? Perhaps so strong that we do not want to be around them, so we do what we can to divide from them because they actually become repulsive to us? We become convinced that they are evil, unconverted, that we cannot control them so that they will do or be what we want them to do or be. When this happens, the mark—the spirit of this world—worldliness—might just be gaining the upper hand in our lives.