There are actually several scriptures which answer this question clearly, but I will leave those for anyone who wants to provide them.
For starters, I will simply cite a modern vision on how it is in reality the greatest and most powerful strategy Satan is using in our time:
Given in the 1980s:
The demonic army was so large that it stretched as far as I could see. It was separated into divisions, with each carrying a different banner. The foremost divisions marched under the banners of Pride, Self-Righteousness, Respectability, Selfish Ambition, Unrighteous Judgment and Jealousy. There were many more of these evil divisions beyond my scope of vision, but those in the vanguard of this terrible horde from Hell seemed to be the most powerful. The leader of this army was the Accuser of the Brethren himself.
The weapons carried by this horde were also named. The swords were named Intimidation; the spears were named Treachery; and the arrows were named Accusation, Gossip, Slander and Faultfinding. Scouts and smaller companies of demons - with names such as Rejection, Bitterness, Impatience, Unforgiveness and Lust - were sent in advance of this army to prepare for the main attack…
The primary strategy of this army was to cause division on every possible level of relationship - churches with each other; congregations with their pastors, husbands and wives, children and parents, and even children with each other. The scouts were sent to locate the openings in churches, families or individuals that such spirits as Rejection, Bitterness and Lust could exploit and enlarge. Through these openings would pour demonic influences that completely overwhelmed their victims.
The most shocking part of this was that this horde was not riding on horses, but primarily on Christians! Most of them were well-dressed, respectable, and had the appearance of being refined and educated, but there also seemed to be representatives from almost every walk of life. While these people professed Christian truths in order to appease their consciences, they lived their lives in agreement with the powers of darkness. As they agreed with those powers, their assigned demons grew and more easily directed their actions…
I noted that the demons were riding on these Christians, but were not in them as was the case with non-Christians. It was obvious that these believers had only to stop agreeing with their demons in order to get free of them. For example, if the Christian on whom a demon of jealousy was riding just started to question the jealousy, that demon would weaken very fast. When this happened, the weakened demon would cry out and the leader of the division would direct all the demons around that Christian to attack him until the jealousy, etc., would build up on him again. If this did not work, the demons would begin quoting scriptures, perverting them in a way that would justify the bitterness, accusations or other satanic influences they were spreading.
As I looked far to the rear of this army, I saw the entourage of the Accuser himself. I began to understand his strategy, and I was amazed that it was so simple. He knew that a house divided cannot stand, and his army represented an attempt to bring such division to the church that she would be powerless and ineffective.
It was apparent that the only way the Accuser could do this was to use Christians to war against their own brethren, and that is why almost everyone in the forward divisions was a Christian, or at least a professing Christian. Every step these deceived believers took in obedience to the Accuser strengthened his power over them. This made his confidence and the confidence of all his commanders grow with the progress of the army as it marched forward. It was apparent that the power of this army depended upon the agreement of these Christians with the ways of evil.
For starters, I will simply cite a modern vision on how it is in reality the greatest and most powerful strategy Satan is using in our time:
Given in the 1980s:
The demonic army was so large that it stretched as far as I could see. It was separated into divisions, with each carrying a different banner. The foremost divisions marched under the banners of Pride, Self-Righteousness, Respectability, Selfish Ambition, Unrighteous Judgment and Jealousy. There were many more of these evil divisions beyond my scope of vision, but those in the vanguard of this terrible horde from Hell seemed to be the most powerful. The leader of this army was the Accuser of the Brethren himself.
The weapons carried by this horde were also named. The swords were named Intimidation; the spears were named Treachery; and the arrows were named Accusation, Gossip, Slander and Faultfinding. Scouts and smaller companies of demons - with names such as Rejection, Bitterness, Impatience, Unforgiveness and Lust - were sent in advance of this army to prepare for the main attack…
The primary strategy of this army was to cause division on every possible level of relationship - churches with each other; congregations with their pastors, husbands and wives, children and parents, and even children with each other. The scouts were sent to locate the openings in churches, families or individuals that such spirits as Rejection, Bitterness and Lust could exploit and enlarge. Through these openings would pour demonic influences that completely overwhelmed their victims.
The most shocking part of this was that this horde was not riding on horses, but primarily on Christians! Most of them were well-dressed, respectable, and had the appearance of being refined and educated, but there also seemed to be representatives from almost every walk of life. While these people professed Christian truths in order to appease their consciences, they lived their lives in agreement with the powers of darkness. As they agreed with those powers, their assigned demons grew and more easily directed their actions…
I noted that the demons were riding on these Christians, but were not in them as was the case with non-Christians. It was obvious that these believers had only to stop agreeing with their demons in order to get free of them. For example, if the Christian on whom a demon of jealousy was riding just started to question the jealousy, that demon would weaken very fast. When this happened, the weakened demon would cry out and the leader of the division would direct all the demons around that Christian to attack him until the jealousy, etc., would build up on him again. If this did not work, the demons would begin quoting scriptures, perverting them in a way that would justify the bitterness, accusations or other satanic influences they were spreading.
As I looked far to the rear of this army, I saw the entourage of the Accuser himself. I began to understand his strategy, and I was amazed that it was so simple. He knew that a house divided cannot stand, and his army represented an attempt to bring such division to the church that she would be powerless and ineffective.
It was apparent that the only way the Accuser could do this was to use Christians to war against their own brethren, and that is why almost everyone in the forward divisions was a Christian, or at least a professing Christian. Every step these deceived believers took in obedience to the Accuser strengthened his power over them. This made his confidence and the confidence of all his commanders grow with the progress of the army as it marched forward. It was apparent that the power of this army depended upon the agreement of these Christians with the ways of evil.