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.)
Secularism in Israel
The Jewish population of Israel, can be divided, albeit imperfectly, into three groups: Orthodox, Traditional, and Secular. The largest group is the Secular Jews making up 41.4% of the Jewish population, followed by the Traditional Jews accounting for 38.5% of the population, with the remaining 20% populated by the orthodox and ultra-orthodox. In Israel, the Reform and Conservative movements are estimated to make up 7.6% of the Jewish population, a significantly lower rate compared to the Jewish diaspora.