"Christianity is a simplified form of Judaism, originally designed for the Greek and Roman pagan masses."The Christian Bible -- Old and New Testament -- was written by Jews. The Apostles were Jews. The first Christians were Jews. Jesus was (and is) the promised Messiah.
Christianity is for the Jews if it is for anyone.
"its little testament (the "New" testament) has superceded the Jewish testament (the "Old" testament)."Israel did such a nice job upholding the Mosaic Covenant?
Christ came to fulfill all that was written about Him in the Law and Prophets.
The Old Covenant that came by way of Moses was one of works. The New Covenant, written in the Messiah's blood, is one of faith.
"the Muslims say they've superceded both Jews and Christians."The perfect Lamb of God Who takes away the sin of the world on one hand, a lying, stealing, enslaving, raping, murderous, genocidal pedophile on the other.
The distinction is clear.
"All individuals who follow the Golden Rule have a "share in the world to come."But YHWH says that the "soul that sins is the one who will die."
How can you possibly put your hope for eternal life in your works?
There is only one Sacrifice for sins, and that was made two thousand years ago by the true Paschal Lamb.