Ex-Mormon or post-Mormon refers to a disaffiliate of the Church of Jesus Christ of Latter-day Saints (LDS Church) or any of its schismatic breakoffs, collectively called "Mormonism". Ex-Mormons—sometimes referred to as exmo or postmo—may neither believe in nor affiliate with the LDS Church. In contrast, Jack Mormons may believe but do not affiliate; and cultural Mormons may or may not affiliate but do not believe in certain doctrines or practices of the LDS Church. The distinction is important to a large segment of ex-Mormons, many of whom consider their decision to leave as morally compelling and socially risky. According to 2014 Pew data, around 1/3 of adults raised LDS no longer adhere to the faith (up from around 10% in the 1970s and 1980s) and in 2008 only 25% of LDS young adults are actively involved. Many ex-Mormons experience troubles with family members who still follow Mormon teachings. Aggregations of ex-Mormons may comprise a social movement. Reasons for leaving Most ex-Mormons leave Mormonism and the LDS Church because specific intellectual or spiritual reasons have led them to a conviction that the religion is false. The foremost reasons are disbelief both in Joseph Smith as a prophet and in the Book of Mormon as a religious and historical document. Reasons for this disbelief include issues with anthropological, linguistic, archaeological, and genetic evidence against the Book of Mormon in the New World. In addition to rejecting the Book of Mormon for such reasons, the Book of Abraham and other Mormon religious texts are rejected on similar grounds. A study of 3000 people who were formerly affiliated with the LDS Church recorded that 74 percent of respondents cited a disbelief in church doctrine or theology as major reason for leaving the church, but only 4 percent of respondents cited conflict with other church members as a large factor in their decision to leave. Also, just 4 percent claimed that a significant reason for apostasy was dissatisfaction with the rules of conduct professed by the LDS Church. This corroborates the assertion that many Mormons are satisfied with the communal aspect and attributes of LDS Church life. Individuals leave Mormonism for a variety of reasons, although "single reason disaffiliates are rare among former Mormons." Research shows that 43 percent of ex-Mormon left due to unmet spiritual needs. Other reasons for leaving may include a belief that they are in a cult, logical or intellectual appraisal,