It is usually those who have read the Bible and put their own interpretation on it, and when Paul's writings don't gel with what they wanted to believe, they accused his of being a heretic and lose a good deal of the Christian scriptures as a result. Without Paul, Christianity is half baked IMO. He clarifies so many details, especially about death and resurrection. He dealt with many issues and by his own example showed us how to conduct ourselves as disciples of Christ. He was recognized as a follower of Jesus by Jews and also and as an Apostle by the other Apostles.
"Christianity" is the religion instituted by the Roman emperor Constantine, and officialized by the Roman emperor Theodosius, and built on the foundation of the false prophet Paul, and the "worthless shepherd" (Zechariah 11:17) Peter, the "two horns like a lamb" (Revelation 13:11), who were to help "deceive those whole dwell on the earth" (Revelation 13:14). As for the conduct of Paul, simply look to his writings. Romans 7:25, "with my flesh", I serve "the law of sin". Romans 7:17-18, "I know nothing good indwells in me", "so no longer am I doing it, but sin which indwells in me". Those who read Scripture through the lenses of Paul's writing, are on a broad and twisted path (Matthew 7:13) which leads to "destruction".