Watchman Fellowship gives these as four trademarks of a cult–

1. They add to Scripture. 2. They subtract from the person of Christ. 3. They multiply the requirements of salvation. 4. They divide the loyalty of believers.

The four sermons will be dealing with the opposite on each of these four areas–In other words, 1. Sola Scriptura; 2. the Deity of Christ, 3. Salvation By Grace Alone Through Faith Alone In Christ Alone; and 4. The Balance Between Separation And True Christian Unity.

(Found somewhere on the ‘Net).