“For 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. Look to yourselves, that we lose not those things which we have wrought, but that we receive a full reward. Whosoever 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.” 2 John 1:7-9 (KJV)
It does matter how we see Jesus. If you see Jesus as a good teacher, a prophet, or a good man, and deny His teachings – such as – “My Father and I are One” (John 10:30), then, how do you believe He was a good teacher, a prophet, or a good man? If He lied about the things He teaches of Himself, then He was a liar, and His teachings unreliable. “Let God be true, and every man a liar” (Romans 3:4). If Jesus is the Son of God as He said then He is Divine and is Incarnate God.
There is one thing that separates the fellowship of Christ from other so called fellowships. The love that has Jesus Christ as its basis, its standard, and foundation.
Some teachers and teachings declare that Jesus was only a spirit being – similar to the angels that appear as men. If that was true then there was no actual body that died on the cross, and no resurrection. The Scriptures say, “… He took not on Him the nature of angels: but He took on Him the seed of Abraham” (Hebrews 2:16). He became flesh. To deny Jesus became flesh [God Incarnate] is to deny the truth.
Those who teach a different Jesus are deceivers, even antichrist. Paul writes, “…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 fact must be stressed over and over again that false teaching is harmful and deadly to the individual Christian, and to the whole body of Christ [the Church] if it is allowed in our churches and lives.
There are many religions that profess to be “Christian”. If they deny that Jesus Christ is God in flesh they are a deceiver and liars. If they declare His deity, yet claim that it is something all mankind can attain as well (that is deity, and that we can all become gods), then that robs the glory that belongs only to Jesus, and that is reserved solely for Him; and those who teach such are “antichrist” deceivers.
“The doctrine of Christ” (v. 9) is the pure Bible doctrine [teaching] that Jesus is the Christ, the Son of God, God become flesh (John 1:1, 14), and God the Son. Anyone or any group denying this doctrine, or equating godhood to any other is a liar and antichrist. He or they are not of God. They are not to be accepted in the fellowship of Christ or His Church.
In the following verses of 2 John 1:10-11 the apostle John warns followers of Jesus Christ not even to allow the teachers of the antichrist doctrine into their homes; neither to tell them “Goodbye”. To tell them “Goodbye” is to tell them “Godspeed” or “God bless you”.
It really does make a difference what you believe about Jesus Christ the Son of God, God the Son.