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.)
Judaism
Countries such as the United States, Israel, Canada, United Kingdom, Argentina and South Africa contain large Jewish populations. Jewish religious practice varies widely through all levels of observance. According to the 2001 edition of the National Jewish Population Survey, in the United States' Jewish community—the world's second largest—4.3 million Jews out of 5.1 million had some sort of connection to the religion. Of that population of connected Jews, 80% participated in some sort of Jewish religious observance, but only 48% belonged to a congregation, and fewer than 16% attend regularly.