I don't mean to offend but you seem to have an unusual disconnect from the Old and New Testament. They are all considered God inspired written by God through men inspired by His Spirit. The gosple is one. I believe this has ALWAYS been the position of the Church as well as the church. Orthodox, Catholic, and Protestants.
That being said, when the scriptures states,
As far as your discussions with what Jews believe NOW is irrelevant. The simple fact is that those Jews who believe in the Messiah are now Christians. There are not some quasi-Christian/Jew thing contrary to popular "dual" theology nonsense.
Very insightful and absolutely correct. I too do not understand the disconnect that some here have between the old and the new testament, nor do I understand where some statements come from, just blithely stated as facts.-- There is one bible, with one theology. The Plan of Salvation is the one theme that makes it a seamless book, a seamless theology and a seamless religion.