Each community has its own rabbi/rabbis. There's no one central leader today.
Judaism is called Judaism.
Judaism.
Judaism is widely practiced today (21st Century). Also, separate from its practice, Judaism is arguably STUDIED today by more people than ever before in its history.
The people who follow Judaism are called Jews.
Rabbis.
In the first half of the 20th century Conservative Judaism had fast growth. In the 1990's the Conservative Judaism was the largest denomination. Today it is not the largest denomination in America.
Judaism.
Very well, thank you.
Israel is 75% Jewish.
Wherever there are Jews.
Judaism (the original, not today's), Christianity (the original, not today's), and Islam...
For Judaism: http://judaism.answers.com/jewish-history/judaisms-influence