What does the Bible teach about false gospels?

False gospels are warned against throughout Scripture, particularly in passages like 2 Thessalonians 2:11-12, which indicate that those who reject the truth are susceptible to strong delusions. Such messages often condition salvation on human works or decisions rather than on Christ's completed work on the cross. They can lead to spiritual destruction as they divert believers away from their reliance on God's sovereign grace. This doctrine stresses that salvation is not about human effort but is solely rooted in Christ's sacrifice, encouraging Christians to remain vigilant and discerning in the face of misleading teachings.