When a church or Christian is not careful to guard Biblical doctrine, it leads to moral compromise. The reverse is also true. The fourth of the 7 Churches in Revelation 2 was Thyatira. They had allowed a woman to contradict Scripture and teach that Christians can be immoral and worldly while claiming to know Jesus as Savior and Lord. In this study, we see the parallels to our time, and learn practical ways to guard against moral compromise.