Hi! ProudPapa
You asked: "What is it to deny That Jesus Christ came in the Flesh??"
How 'bout I turn the question around to ask: What is it to confess that Jesus came in the flesh?
The question touches the very heart of our gospel. John was making mention about the criteria for the discernment between antichrist and the Holy Spirit: "Every spirit which confesses that Jesus Christ has come in the flesh is of God; and every spirit which does not confess Jesus is not of God", (1John 4:3).
At first glance, this verse is usually interpreted to address matters concerning the divinity of Jesus. Actually this is not the issue which John is writing about.
The crucial which John intends is:
Do God's people confess that in Jesus' humanity God has taken on life in the flesh? Do they confess that our Saviour's life and work are an exact expression of the nature and purposes of God? Do they believe that "He is the reflection of God's glory", "bearing the very stamp of God's nature", as Hebrews puts it so clearly?, (1:3).
Jesus' life was not an attempt to show that He was God, as many wrongly believe. No, His life was dedicated to showing who God was, and how He, the unchanging One, will always be.
I made the comment earlier in this Forum that one of the most important questions which every Christian must answer for themselves is: "Who is God and what is He like?".
Without a scriptural answer to this question, we remain unable to consistently confess that God is ONLY and perfectly good. So it was that Jesus declared, "He who has seen me has seen the Father".
What do I mean when saying that we must acknowledge that God is only and perfectly good?
Well, Proudpapa, there seems to be a lot of confusion about the idea that God is only good. I wish I could summarize it all in 2 'er 3 sentences and afford the confession it's due justice. But I'm not that good at crafting synoposis. :)
I guess it's at least ten years now since I had published an article related to the confession that God is only good. I would agree to reproduce it here if people should wish to read it.
I jus' luv yer Nick, by the way.