1 John 4:2 says, "By this, you know the Spirit of God: Every spirit that confesses that Jesus Christ has come in the flesh is of God."
John uses two names: Jesus, which refers to His human name, and Christ, which refers to His divine title. Jesus Christ is fully man and fully Messiah at the same time. Christ, which means Messiah, the Anointed One is His divine title. Jesus is God in human flesh. This is the fundamental doctrine of our faith - that God stepped out of Heaven and took upon human flesh. We call that the incarnation. Carnis means flesh.
When Jesus Christ took upon Himself humanity, He did not take it while He was here on earth and then laid it aside when He went back to Heaven. He took His humanity back to Heaven with Him. For all eternity Jesus Christ will be a man.
Luke 2:11; Luke 9:20; John 4:42; John 6:69; John 11:27; John 20:31; Acts 5:42; Romans 8:39; 1 Corinthians 1:30; 2 Corinthians 5:17-20; Galatians 6:14; Philippians 2:5-11; Philippians 3:7-9; Colossians 3:1-4; 1 Timothy 1:15-16; 1 Timothy 2:5; Hebrews 13:8; 1 Peter 3:18; 1 John 5:20