What are the effects of heresy?

Heresy brings confusion for unbelievers since they hear several different and contradictory voices all claiming to be telling them the authentic good news.

Heresy also brings trouble for the Church. Unless false teachers are silenced, as Paul tells Titus that they should be, they will ruin households and upset the faith of some (Titus 1:11). Genuine believers can be unsettled by the teaching of these men (2 Tim. 2:18). In addition to this damage, false teachers also drain the time, energy, and resources of churches when they are not dealt with. Drawn out conflicts with false teachers can divert and distract gospel churches from evangelism and the planting and nurturing of new congregations.

Heresy places those who embrace it, and refuse to be corrected, in danger of eternal condemnation. At the very least the salvation of those who are deceived by gospel denying error cannot be affirmed. There is hope that God may grant such people repentance. But the apostles did not shrink back from spelling out the danger of turning to a “different gospel.” Paul makes it clear that whether the “false brothers,” an angel from heaven, or even the apostles themselves preached another gospel than the one that Paul had preached then they should be accursed (Gal. 1:6-9).

Harold Brown summed up the consequences of truth and error by saying that “just as there are doctrines that are true, and that can bring salvation, there are those that are false, so false that they can spell eternal damnation for those who have the misfortune to be entrapped by them.”