So what exactly is the "Great Sin"? Not preacing repentance on street corners? Not writing letters? Not confronting false teachers? Not listening to Way of the Master?
Funny, I don't see Paul using WotM...
"And Paul
went in, as was his custom, and on three Sabbath days he
reasoned with them from the Scriptures,
explaining and proving that it was necessary for the Christ to suffer and to rise from the dead, and saying, "This Jesus, whom I proclaim to you, is the Christ."" Acts 17:2-3 ESV
"So he reasoned in the synagogue with the Jews and the devout persons, and in the marketplace every day with those who happened to be there[/B]. Some of the Epicurean and Stoic philosophers also conversed with him. And some said, "What does this babbler wish to say?" Others said, "He seems to be a preacher of foreign divinities"-
-because he was preaching Jesus and the resurrection." Acts 17:17-18 ESV
"And
he reasoned in the synagogue every Sabbath, and tried to persuade Jews and Greeks. When Silas and Timothy arrived from Macedonia, Paul was occupied with the word,
testifying to the Jews that the Christ was Jesus." Acts 18:4-5 ESV
And I didn't see Jude tell them to write letters to heretical churches, rather he told them to build up each other in the holy faith and pray.
"But you must remember, beloved, the predictions of the apostles of our Lord Jesus Christ. They said to you, “In the last time there will be scoffers, following their own ungodly passions.”
It is these who cause divisions, worldly people, devoid of the Spirit.
But you, beloved, building yourselves up in your most holy faith and praying in the Holy Spirit, keep yourselves in the love of God, waiting for the mercy of our Lord Jesus Christ that leads to eternal life. And have mercy on those who doubt; save others by snatching them out of the fire; to others show mercy with fear, hating even the garment stained by the flesh." Jude 17-23 ESV
But what I see no where is them walking around proclaiming that God was getting ready to destroy them.