No wonder people and churches are so mixed up

Matt, Mark, Luke Hebrews Revelation John, John and Peter's epistles and James were written only to the 12 tribes of Israel. Jews. The only message to me and other gentiles is Romans through Philemon. Even the 7 churches no longer exist, consolidating to choosing one book maybe Romans. But the message in it's entirety divides past terror from "but now" , proving we are only saved from hell by the finished work of Christ at the cross. Matt 10 proves Jesus separated the Jews from the gentiles and also that his commandments are only to the Jews at that time. Paul is the apostle to gentiles and his message actually is grace. The free gift of salvation you can't earn. But of course nobody agrees. Pride and self righteousness is a disease man can't be cured of once it gets a hold. Smh. Oh well. I enjoy rest and eternal security every day because I trust that what Jesus did for me is enough. I refuse to insult God by thinking any part of my effort, lifestyle or actions could ever "assist" God and his power. He's sovereign and I am untrustworthy.