2 John 7-11, KJV
7For many deceivers are entered into the world, who confess not that Jesus Christ is come in the flesh. This is a deceiver and an antichrist.8Look to yourselves, that we lose not those things which we have wrought, but that we receive a full reward.9Whosoever transgresseth, and abideth not in the doctrine of Christ, hath not God. He that abideth in the doctrine of Christ, he hath both the Father and the Son.10If there come any unto you, and bring not this doctrine, receive him not into your house, neither bid him God speed:11For he that biddeth him God speed is partaker of his evil deeds.
This passage went inline with what I recently studied in John 10 pertaining to the many deceivers. This scripture basically instructs us to stand up for our faith in Christ. If there be any that comes to us preaching any OTHER doctrine, we are not to bid them well. To bid well to them or any encouragement, we are agreeing that what they’re saying is okay. It is not okay to worship other gods, regardless of what the world says. To be a friend to the world is to be an enemy of God—the true and living Holy God.
Additional Reading: 2 John 1-13