So you're saying it's not necessary to try to understand the intended meaning of a passage or that grammar is unnecessary or that the passage is too vague? What do you mean "shades" of meaning? I'd think there's only so many meanings and that the author intended something very specific. I don't think you understood what I said in the OP that those who were being claimed to deny Jesus were already probably Christians because they were following the "Grace" doctrine to begin with. Luke 9:22 is not referring to people who already believe in Jesus. Jude 1:4 is. Why don't you give your interpretation of everything involved in Jude 1:4. Who are the ones who are "turning the doctrine of grace into a license to sin"? Obviously it's not referring to the Jews and High Priests who rejected Jesus as Christ altogether. This was the point of the OP in itself, your definition of "deny" is exactly what I'm trying to say is NOT the case in Jude 1:4.
It's one thing to recognize that Jesus was the Christ, even heretics did that, it's another to actually obey his teachings, which is the context of the passage in question. Jesus specifically said in Matthew 7:22-23, there will be many who call him "lord" but he will reject them because they are "doers of Lawlessness" who do not obey His Father's will.
Shermana,
To deny Jesus is to deny that he is who he said he is.
I don't know which translation you are reading from, some are clearer than others, by their wording.
I really don't see anything difficult to understand in Jude 4. Jude was writing about some men that had entered into the Christian congregation, and used the Grace or undeserved kindness of God wrongly. Some had the idea that because God was forgiving, it meant they could do anything they wanted to and it would cause God's mercy to abound even more.
Jude was telling that these men, and others like them had already been spoken about, these men were already condemned because they did not believe that Jesus was the Christ, John 3:18. Jude was pointing out that these men would not come under the Ransom sacrifice of Jesus, the Messiah or Christ, Heb 10:26, Rom 3:7,8.
Most of the Jews did not believe that Jesus was the Christ. If they did they would have obeyed his teachings, John 1:9-13, 5:39,40.
In Paul's writings he said that only a remnant of the Jews would be saved, Rom 9:27, 11:5. Also consider what Jesus said at Luke 13:23,24, Matt 7:13,14.
Also look what Jesus said at Matt 23:37,38.
Anyone who did not believe that Jesus was the Christ and the son of God was an Antichrist. The same is true today, and if they deny who Jesus is, they do not have his Father either, 1John 2:22,23.
Jesus is the only mediator between God and man, 1Tim 2:5. Belief in Jesus and following his steps closely is the only way to salvation, 1Pet 2:21, Acts 4:12, John 14:6. Jesus came to give his life for all who had faith in him, John 1:29, and anyone who does not had no ransom for them, Matt 20:28, Gal 2:16, Acts 13:38,39.