Some examples:
By a mezuzah on the door
By a kippah on the head (of males)
Synagogues
The first Christians were Jewish.
If not for the Maccabees, the Seleucid Empire would have extinguished the Jewish religion and forced all Jews to adopt Greek ways.
Because they worship the same God.
To be Jewish can mean you either practice the Jewish religion, or are from a Jewish decent. It is both a race and a religion. Someone that is culturally Jewish may not practice the religion, but has a Jewish heritage. Likewise, people that do practice the Jewish religion do not have to be culturally Jewish, or have Jewish ancestors.
There aren't areas of the Jewish religion.
They didn't preserve their religion. The Bible tells us that time and time again the Jews deviated from what God gave them but God used adversity/opression to bring them back to His ways. So you can say it was god who preserved the Jewish religion.
Jewish Institute of Religion was created in 1922.
Jewish Institute of Religion ended in 1950.
Judaism ... the religion of the Jewish People ... is comprisedof a single religion, known as "Judaism".Judaism ... the religion of the Jewish People ... is comprisedof a single religion, known as "Judaism".
Jew
Yes. Judaism is the religion. Jewish is the adjective pertaining to that religion.
She is Jewish.