Q&A: Many churches adopt confessions, why then do leaders and laypersons often stray from orthodoxy? What lessons can we learn from this?

Q. Many churches adopt confessions, why then do leaders and laypersons often stray from orthodoxy? What lessons can we learn from this?
A. Confessions are good and have biblical precedent. Humans, however, are fallen and as 1 Timothy 4:1 says, “some will abandon the faith and follow deceiving spirits and things taught by demons.” People are lovers of self rather than lovers of God (2 Tim. 3:2-4). That is why there are problems with heterodoxy and heresy, even where there are solid confessions in place. Confessions may not keep false teaching from emerging but it is helpful to have them in place to quench the spread (like gangrene) of unhealthy teaching.
One lesson we learn from the prevalence of unhealthy belief and teaching is the importance of qualified leaders. It is vital that pastors/elders be able to teach (1 Tim. 3:2) and correct opponents of the truth (2 Tim. 2:25). We also see the important place of church discipline. The church is set apart as the light of the world and the “pillar and buttress of the truth” (1 Tim. 3:15) if the truth is not proclaimed and protected by the church how dark will the darkness be?!
The second lesson is that churches must work hard to be watchful and stand firm in the faith (1 Cor. 16:13). If someone is contradicting orthodox teaching and causing division then they should be removed from the church community (1 Tim. 6:20-21; 2 Tim. 3:5; Titus 3:10). The church is to be the set apart people of God (Eph. 1:4; 5:27). Thus, Paul writes “stand firm and hold to the traditions that you were taught by us, either by our spoken word or by our letter” (2 Thess. 2:15).