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 prayer
Throughout Orthodox Judaism, including its most liberal forms, men and women are required to sit in separate sections with a mechitza (partition) separating them. Historically, a learned woman in the "weibershul" (women's section or annex) of a synagogue took on the informal role of precentress or firzogerin for the women praying in parallel to the main service led in the men's section. Conservative/Masorti Judaism permits mixed seating (almost universally in the United States, but not in all countries). All Reform and Reconstructionist congregations have mixed seating.