"The apostle John wrote in strong words the divine condemnation of deceivers who deny that Jesus is the Christ of God manifest in the flesh. Check it out, friend. What does your church teach and what does your preacher believe about Jesus Christ? All that scriptures says about Him and all that He declares concerning Himself is true.
The one who departs from either is a false teacher and dispenser of a false gospel
. . .
"The Word of God clearly condemns anyone who perverts the gospel of the grace of God, or who departs from the doctrine of Christ. In fact, you will find no stronger language in all of Scripture. Paul said that even an angel would be "accursed" if he preached anything different. Read for yourself his inspired words:
But though we, or an angel from heaven, preach any other gospel unto you than that which we have preached unto you, let him be accursed. (Galatians 1:8)
"The curse of God is upon all preaching that says man has to work to be saved or to be kept saved. This sounds the death knell to all who mingle law and grace. John gave this warning about anyone who preaches another gospel.
If there come any unto you, and bring not this doctrine, receive him not into your house, neither bid him Godspeed; For he that biddeth him Godspeed is partaker of his evil deeds (2 John 1:10-11)
"At the time of John's writing, the homes of the Christians were the primary places for assembly and worship. Stated simply, these believers were to have no fellowship whatever with one who preached a different gospel and who denied the doctrine of Christ.
"May I put it pointedly to you? If you are affiliated with a church or a religious group that tolerates the preaching of another gospel, or that goes beyond or does not abide in the doctrine of Christ, you are not only exposing your family to false teaching but are disobeying the Word of God. Ephesians 5:11 commands us to
'have no fellowship with the unfruitful works of darkness but, rather, reprove them.' "
http://paulsgracemessage.blogspot.com/2016/02/which-gospel-when-by-paul-r-van-gorder.html