I see your context and basically agree mostly, but ignoring the gospels would mean ignoring the Olivet discourse which is a key to Revelation. The geneology of the Messiah. Then there are the great parables that teach us about God's character, like the prodigal son......tho he strayed to the pig pen he was still welcome in the Father's home, the lesson being that if God is your FATHER, you can't ever NOT be His son. (once saved, always saved) Jesus was dropping bread crumbs of hope and a new covenant of grace if the Jews would follow it. WE need the gospels for HISTORY also as they are the link for Gentiles and Jews to God's history with man.
And the word is HERESY, not heiracy. And not all bad teaching is heresy, a good part could be called apostasy. Just so ya know.