Hebrew.
Hebrew. Although, it is important to note that the term "official language" refers to a national government, which Judaism does not have. While Israel is a Jewish country, it is not a country ruled by Judaism. (This is as opposed to Vatican City which is a nation ruled by Catholicism.) Judaism does have a sacred language and a religious language (both of which are Hebrew), but the term "official language" is not apropos.
Hebrew is considered a sacred language in many religious traditions, including Judaism, where it is believed to be the language in which God communicated with humanity.
Judaism has not had one central religious leader in almost 2,000 years.
As part of a religious ceremony of the religion of Judaism.
There hasn't been a religious leader of all Judaism in roughly 1600 years.
Religious Action Center of Reform Judaism was created in 1961.
The question as put is unclear. Please resubmit. Are you asking about the "history of the religion of judaism", "history of the development of religious judaism", "history of relgious Jews", etc.?
rabbis
a rabbi
The Star of David.
The Koran is the religious text of Islam. The Torah is the core religious text of Judaism. Neither are places.
Sounds like a Zen koan. In Judaism, a Jew is fully a member of the Jewish people if he/she was born Jewish, or had a valid conversion into Judaism. Religious Judaism holds that a Jew can most fully express and nurture their Judaism by living according to the Torah. This is called by several names: religious Judaism; Torah-Judaism; Orthodox Judaism.