I do not call it circular reasoning... I think it is called unbiased thinking. You know, looking at the facts presented instead of taking cues from someone else.
As ar as Jesus bringing that new covenant... that is your belief. The Jews of today DO NOT BELIEVE that Jesus brought anything... he was a nice man and a pretty good carpenter, it's too bad what they did to him.
As far as your assertion of who killed the "son of god"... well, again, they did nothing they were not preordained to do.
Interesting, your Ben Franklin reference. Of course I would not believe you were Ben Franklin... there is no proof. Much as to why I do not believe the bible is divinely inspired, or even true for that matter... there is no proof. If I were to believe in God, it would be because he gave me the ability to think, and not just to blindly follow. I have problems believing anything that comes from a book that is the greatest tool used to justify hatred, prejudice, and murder our world has EVER known.
In refernceing the "True Jew"... are you only including Israelis? Personally, I would think anyone who actually practices the Jewish faith would be a true Jew. 85% of our country say they are Christian... of those, how many do you think are real Christians?