An Apostate Jew
A Jew that converts to another religion.
A Jew is a person. Judaism is a religion. A Jew is a person of the religion of Judaism (the Jewish religion).See also the Related Link.What is Judaism
He is Jew
No. Jewish custom is never to enter the house of worship for another religion.
Yes, by giving up the religion, or simply converting to different religion. Jews during the Third Reich in Germany could convert, but as soon as a Jewish ancestor was found in your bloodline, you were considered a Jew. In other words, converting to another religion did not help them. Most 'Jew-spotters' seem to regard anyone with a Jewish grandparents as a Jew. To put the matter differently, it depends on the definitions used.
Sure. "I am of the Jewish religion." is a grammatically correct sentence. However, it sounds odd and no Jew would actually phrase it that way. They would say either: "I am a Jew." or "I belong to the Jewish religion." I have personally never understood why Non-Jews are so hesitant to use the word "Jew", it is the way most Jews refer to one another. It is only when said with contempt or disgust that the word "Jew" is an insult.
He is a Jew.
jew
Hes a Jew
Hes a Jew
he was a jew