The saloons and the gambling hells and the brothels are not the chief spheres of Satan's activities, but the schools and colleges and theological seminaries where he is inducing men and women, and callow youths and maidens, to doubt the truth of God's Word, and to reject the fundamental truths of God's word and accept Satan's errors in their place. Satan knows well; that, if he can get men to doubting God's Word, it is easy to lead them into the vilest sins. False doctrine has been a more prolific source of the vilest sins than even the saloons. 2. But Satan not merely tempts men to sin by insinuating doubts of God's Word, he also _has his_ +synagogues and ministers among men to do his work.+ Turn to Rev. 3:9: +"Behold, I give of the synagogue of Satan, of them that say they are Jews, and are not, but do lie; behold, I will make them to come and worship before thy feet, and to know that I have loved thee."+ What I wish you to notice here are the words, "The synagogue of Satan." In this case it was a Jewish synagogue, but now-a-days, it is often a so-called Christian church. In II Cor. 11:14, 15 we have an even more remarkable passage: +"For even Satan fashioneth himself into an angel of light. (15) It is no great thing therefore if his ministers also fashion themselves as ministers of righteousness; whose end shall be according to their works."+ Here we are told that Satan has his ministers. They do not advertise themselves as ministers of Satan, oftentimes they are not even conscious that they are; but they put themselves forward as "ministers of righteousness." They advocate "_ethical culture_," a system of salvation without atoning blood. They are frequently men of very attractive personality and great intellectual brilliance and ability, but they are doing the Devil's work. Satan is never so dangerous as when he "Fashioneth himself into an angel of light," and no other ministers of his are so dangerous as the men and women of attractive personality and brilliant intellectual gifts who are undermining the faith of God's children, or who are teaching various forms of seductive and alluring error, "Christian Science," "New Thought," "Theosophy," "Occultism" (Spiritualism), and all that species of cults. 3. We have not time to speak here of Satan's work as the author of sickness (Acts 10:38; Luke 13:16), and as the one who has the power of death (Heb. 2:14).