Designs ****PT- Romans is pretty good proof of someone making it up***
Romans is his biggest letter, that's why it's first in the canon of his letters. however, you have not shown me any specific reference to Paul starting a new religion.
Let me give you a specific reference where it shows he was NOT starting a new religion and was only interest in the Israel of God and it's fullfillment. Read Romans chapter 9,10, 11,
Paul again begins his discussion with a question: “Did God reject His people whom He foreknew?” According to the New Testament, Israel was apparently replaced ( Matt. 21:43 ) by a “nation” (ethnos and notgenan) that would bear fruit. Christ’s words were mostly critical of the current first century generation of Jews who had not produced fruit. The reference to “another nation” is a reference to the present form of the kingdom, the Church, a nation called out of the nations ( 1 Pet. 2:9,10 ). But Israel still had the oracles—their promises and their advantages were not nullified because the Lord turned to the Gentiles to bear fruit. Paul will ask, “Did Israel fall irrevocably?” (11:11)—Not at all! was his answer. This was another chapter in God’s dealings with Israel: God made promises to Israel, and although the majority of Israelites time and time again had sinned and been sent from the land, the promises remained.
So in the chapter Paul will point out that the rejection of Israel is not complete (there is a remnant of believers) and not final (all Israel shall be saved). His discussion will be essentially in two major parts, both begun with “I ask then” (vv. 1 and 11).
Also Galatians 6: 14 But far be it from me to boast, save in the cross of our Lord Jesus Christ, through which the world hath been crucified unto me, and I unto the world. 15 For neither is circumcision anything, nor uncircumcision, but a new creation. 16 And as many as shall walk by this rule, peace be upon them, and mercy, and upon the Israel of God.