A: When there is a drift into a condition of apostasy.
Apostasy is when a church denounces, disassociates, abandons or rejects something they once believed. Apostasy can also be an abandonment or defiance of what they once held to be true in the past and rebelling against those same beliefs and practices.
Jude’s Warning of Apostasy:
Jude wrote that he “found it necessary to write appealing to you to contend for the faith that was once for all delivered to the saints” (Jude 1:3) because “certain people have crept in unnoticed who long ago were designated for this condemnation, ungodly people, who pervert the grace of our God into sensuality and deny our only Master and Lord, Jesus Christ” (Jude 1:4).
Paul saw it happening in his day and in one of his last letters he said “the Spirit expressly says that in later times some will depart from the faith by devoting themselves to deceitful spirits and teachings of demons, through the insincerity of liars whose consciences are seared” (1 Tim 4:1-2) and certainly any teaching from demonic forces must be an apostasy from what the true faith is which Paul said would happen “in later times.”
Peter saw a lot of apostasy that would be coming too writing that “just as there will be false teachers among you, who will secretly bring in destructive heresies, even denying the Master who bought them, bringing upon themselves swift destruction. And many will follow their sensuality, and because of them the way of truth will be blasphemed. And in their greed they will exploit you with false words. Their condemnation from long ago is not idle, and their destruction is not asleep” (1 Pet 2:1-3). So they exploit people with “false words” and blaspheme “the way of truth” but they will come to destruction and then condemnation.
In the very last letter that Paul wrote he told Timothy that “the time is coming when people will not endure sound teaching, but having itching ears they will accumulate for themselves teachers to suit their own passions, and will turn away from listening to the truth and wander off into myths” (2 Tim 4:3-4). Anything that is taught as a “man-pleaser” or to tickle the ears, must be considered apostasy for anything taken away from or added to the gospel makes it another gospel entirely and one that is altogether different and isn’t really a gospel at all (Gal 1:7). There are certainly a lot of apostate teachers and preachers out there today. Paul would identify “such men [as] false apostles, deceitful workmen, disguising themselves as apostles of Christ. And no wonder, for even Satan disguises himself as an angel of light. So it is no surprise if his servants, also, disguise themselves as servants of righteousness. Their end will correspond to their deeds” (2 Cor 11:13-15). An apostate teacher or preacher is disguised “as an angel of light” meaning they look like they’re teaching the gospel but they’re really apostates and what they teach is actually apostasy or the doctrine of demons.
Guarding Against Apostate Teachings
One of the best ways to discern apostasy from the real gospel is to be consistently in the Word of God and why the author of Hebrews wrote that “for everyone who lives on milk is unskilled in the word of righteousness, since he is a child. But solid food is for the mature, for those who have their powers of discernment trained by constant practice to distinguish good from evil” (Heb 5:13-14) so if someone is not growing in biblical knowledge (lives on milk) rather than knowing more biblical knowledge (on solid food) their powers of discernment are not trained by constant practice in the Word and thus, cannot “distinguish good from evil” teachings by apostates.
Best Way to Avoid Apostasy or Reject the Teachings
The Bible warns us that “in the last days there will come times of difficulty” (2 Tim 3:1) and many will have “the appearance of godliness, but denying its power” (2 Tim 3:5). The best way to avoid apostasy and reject the teachings of apostates is to be reading the Word of God, study the Word of God, and listen to good expository biblical teachings in church.