They were called rabbis meaning teacher or learned one.
Judaism is taught by teachers, scholars, rabbis, and cantors.
There is no one biggest person in Judaism. There have been thousands of leaders, teachers, and rabbis.
Judaism is called Judaism.
These people are the scribes and Pharisees of Jesus day they were the teachers of Judaism.
They are called "Jews".
Judaism today doesn't really have leaders, but if you mean teachers or Rabbis, you would need to study in a formal institution.
University teachers are called professors.
A group of teachers is called the faculty of a school.
People who practice Judaism are called Jews.
A group of teachers is called the faculty of a school.
Followers of Judaism are called Jews.
There are no churches in Judaism.