Judaism
Around the 1st century CE, there were several small Jewish sects: the Pharisees, Sadducees, Zealots, Essenes, and Christians. After the destruction of the Second Temple in 70 CE, these sects vanished. Christianity survived, but by breaking with Judaism and becoming a separate religion; the Pharisees survived but in the form of Rabbinic Judaism (today, known simply as "Judaism"). The Sadducees rejected the divine inspiration of the Prophets and the Writings, relying only on the Torah as divinely inspired. Consequently, a number of other core tenets of the Pharisees' belief system (which became the basis for modern Judaism), were also dismissed by the Sadducees. (The Samaritans practiced a similar religion, which is traditionally considered separate from Judaism.)
Jewish education
The Conservative movement has USY - United Synagogue Youth. The Modern Orthodox movement has NCSY - formerly National Conference of Synagogue Youth. BBYO is a non-denominational group, though most Jews associate it with the Conservative or Reform movements. The North American Federation of Temple Youth, known as NFTY, is the organized youth movement of Reform Judaism in North America. Funded and supported by the Union for Reform Judaism, NFTY exists to supplement and support Reform youth groups at the synagogue level. About 750 local youth groups affiliate themselves with the organization, comprising over 8,500 youth members.