Please don't be hurt or angry and go away! Each of us has a place. We are all very human, do forgive and accept it all.
If you find that scriptures disagree, it is because of our understanding, we just have to dig deeper. One way to do it is to use the keyword search for each question you have. Each scripture is the truth, it is up to us to fit it together.
Remember, God created us including how the world operates. It is pretty complicated. Understanding God is a tall order. When we take a fact to extremes it loses its truth. For instance the bible says that the law is a wonderful thing, psalms 119 explains the law. Yet there is a verse saying it is obsolete. If you read every verse about the law you find that yes, it is obsolete for Christ's blood is now current for forgiveness of sins, the old sacrificial system is not useful. Yet every single verse of psalm 119 is truth.
Paul has been misunderstood for way over a thousand years. I think God meant that to happen for it has opened up saving for the gentile. I has sometimes gotten so bad that Jews were murdered and reverant christians tried to say the Old Testament isn't scripture. They quoted Paul to excuse such actions, yet Paul would have rebuked them strongly. In 2Peter 3:15 to the end it even talks about it. When you read the letters, do read the history of the times and the culture of the people Paul was talking to. For instance, the temple was still standing, it was distroyed in 70. No gentile was considered a leader of the Christian Church, scripture was the Old Testament. The leaders of the church were Jews. The gentiles took over leadership after Rome killed so many of the Jews. The Jews thought differently than the gentiles.
Paul had a difficult job, opening up the truth of the world to the gentiles, Paul gave it everything he had. Many of the Jewish leaders weren't much help to him. When the gentiles took over leadership they went too far the other way. Paul is hard to understand, but like Peter says, it is necessary for our very life.
Hang in there! The Holy Spirit will help you. We are living in an age that has wonderful tools to use for learning. But remember, when scripture disagrees it is our understanding. We can rely on our Heavenly Father and He speaks to us through His word.
