It's widely acknowledged that Jesus was a thoroughly practicing Jew throughout his life. Anglican Priest Bruce Chilton expressed that conclusion explicitly and concisely in his book "Rabbi Jesus": "It became clear to me that everything Jesus did was as a Jew, for Jews, and about Jews."
But what about Paul, the Apostle to the Gentiles? It's generally accepted that Paul was the true founder of a new religion called Christianity. Biblical scholar Gerd Ludemann, author of several books about Jesus and Paul including "Paul: Founder of Christianity," affirms that "Without Paul there would be no church and no Christianity." Ludemann adds, "He's the most decisive person that shaped Christianity as it developed. Without Paul we would have had reformed Judaism ... but no Christianity."
Paul converted Jews and then Gentiles to Jewish Christianity, basing these conversions on his belief in the teachings, resurrection and divinity of Jesus. But powerful evidence within "Acts of the Apostles," the book of the New Testament that chronicles Paul's mission, reveals that Paul, like Jesus, remained a dedicated Jew until his execution. In fact, if Paul had simply stated that he was no longer a Jew but the leader of a new religion, he would not have been imprisoned or executed.
During Paul's last visit to Jerusalem, his appearance and teachings in the Temple in Jerusalem set off a disturbance in which some Jews rioted against him (Acts 21:26-28). He was then charged with blasphemy by the Sanhedrin and would have to stand trial before the Jewish authorities -- and face a possible death sentence. The Sanhedrin was able to indict Paul and put him on trial by the special privilege that the Romans gave the Jews. Judaism was a protected religion under the Roman Empire in the time of Jesus and Paul. Jews had their own King (Herod the Great, Herod Antipas and Herod Agrippa). But more important, the Jewish leadership was invested with the right to rule over Jewish affairs. They could bring charges against Jews who violated Jewish laws or who were deemed blasphemous or heretical. That power is why the Sanhedrin was able to indict Jesus. It also explains why the Sanhedrin was able to authorize Paul's persecutory frenzy to chain and drag back to Jerusalem Jewish followers of Jesus in synagogues as distant as Damascus (Acts 8:3; Acts 9: 1, 2). Although the Sanhedrin could bring charges against Jews and even set the punishment, only the Romans could execute (although that's not entirely clear since some violators of Jewish law were stoned to death by Jews).
The special status of Jews was first stated in an edict by the Roman Emperor Caesar Augustus in 1 B.C.E. and reaffirmed by Emperor Claudius Augustus in 41 C.E.:
Edict of Roman Emperor Caesar Augustus on Jewish Rights, 1 BCE
Caesar Augustus, pontifex maximus, holding the tribunician power, proclaims: Since the nation of the Jews and Hyrcanus, their high priest, have been found grateful to the people of the Romans, not only in the present but also in the past, and particularly in the time of my father, Caesar, imperator, it seems good to me and to my advisory council, according to the oaths, by the will of the people of the Romans, that the Jews shall use their own customs in accordance with their ancestral law, just as they used to use them in the time of Hyrcanus, the high priest of their highest god; and that their sacred offerings shall be inviolable and shall be sent to Jerusalem and shall be paid to the financial officials of Jerusalem; and that they shall not give sureties for appearance in court on the Sabbath or on the day of preparation before it after the ninth hour. But if anyone is detected stealing their sacred books or their sacred monies, either from a synagogue or from a mens' apartment, he shall be considered sacrilegious and his property shall be brought into the public treasury of the Romans.
Later, during the ministry of Paul, the Emperor Claudius reconfirmed the special status of Jews:
Edict of Roman Emperor Claudius Augustus on Jewish Rights, 41 CE
Tiberius Claudius Caesar Augustus Germanicus, pontifex maximus, holding the tribunician power, proclaims: ...Therefore it is right that also the Jews, who are in all the world under us, shall maintain their ancestral customs without hindrance and to them I now also command to use this my kindness rather reasonably and not to despise the religious rites of the other nations, but to observe their own laws.
The Romans were tolerant of all religions under their rule as long as adherents obeyed Roman law and paid taxes. While Jews could rule over Jewish matters, they had no jurisdiction over people of other religions. In principle, Roman paganism was an affront to Judaism. But they could do nothing about that other than negotiate with the Romans to mitigate pagan practices in the Temple area and in some public Roman ceremonies.
After his arrest, Paul faced charges of blasphemy: "And after five days Ananias, the high priest, descended with the elders, and with a certain orator named Tertullus, who informed the Governor against Paul" (Acts 24:1).
Paul could only be charged if he were a Jew. After being detained for two years he was brought before the new Roman governor Porcius Festus. The Sanhedrin repeated the charge of blasphemy: "Then the high priest and the chief of the Jews informed him [Festus] against Paul, and besought him" (Acts 25:2). Fearing a trial before the Sanhedrin, Paul invoked his right as a Roman citizen to be tried in Rome. Festus granted Paul his choice: "Hast thou appealed unto Cæsar? Unto Cæsar shalt thou go" (Acts 25:12).
At no time during Paul's lengthy ordeal did he repudiate Judaism or declare that he represented a new religion. Had he done so, he would have been immediately released -- especially since he was a privileged Roman citizen. The Sanhedrin wouldn't have had any authority over Paul.
After a long treacherous trip that included a shipwreck that almost killed him, Paul arrived in Rome and was put under house arrest. He promptly invited the Jewish leadership of Rome to his residence to explain why he was imprisoned:
"Men and brethren, though I have committed nothing against the people, or customs of our fathers, yet was I delivered prisoner from Jerusalem into the hands of the Romans. Who, when they had examined me, would have let me go, because there was no cause of death in me. But when the Jews spake against it, I was constrained to appeal unto Cæsar; not that I had ought to accuse my nation of. For this cause therefore have I called for you, to see you, and to speak with you: because that for the hope of Israel I am bound with this chain." (Acts 28: 17-20)
Still, Paul said nothing about a new religion. On the contrary, he presented himself to the Roman Jewish community as a loyal Jew who was being persecuted for his revisionist views. Since the Romans had no quarrel with him, as a Roman citizen, and with the Sanhedrin a continent away, there would be no viable case against Paul -- if he had denounced his affiliation to Judaism and declared a new religion. At this point in his life, facing trial and execution for blasphemy against Judaism, didn't Paul have every reason to sever his tie to Judaism? The Sanhedrin, representing traditional Judaism, sent a clear message by their action against Paul: "We will not accept your beliefs and teachings about Jesus." Despite this definitive rejection, Paul didn't choose the obvious way out of the clutches of the Sanhedrin: declaration of a new religion. This strategy never even showed up for discussion. Paul chose to go to his death as a Jew. Why?
Paul's vision was to make his brand of Judaism -- with the recognition of Jesus as the Jewish Messiah -- a world religion easily accessible to everyone. He never surrendered that passion. But after his death the accelerating conversion of Gentiles to a movement that began as Jewish Christianity became increasingly distanced from Judaism -- and a new religion was launched.
Nevertheless, an understanding of the deep connection to Judaism held by the founders of Christianity should highlight the common ground of Judaism and Christianity and pave the way to reconciliation between the two faiths.