and hell." He described combat with them as being "desperate, the battle is one of extermination." Bushman describes the characteristics of these anti-Mormon materials as sensationalizing actuality: British author Arthur Conan Doyle's A Study in Scarlet (1887), the novel in which the famous fictional detective Sherlock Holmes made his first appearance, includes a very negative depiction of the early Mormon community in Utah after its migration westwards and the foundation of Salt Lake City. Mormons are presented as violent, rigidly intolerant and corrupt, systematically terrorizing both members of the church and non-Mormon neighbors as well as forcing polygamous marriage on Mormon girls against their will. Later in his career, Conan Doyle apologized to the Mormons for his depiction of their religion. During a 1923 tour of the United States, Doyle was invited to speak at the LDS Church's Salt Lake Tabernacle; while some individual Mormons remained deeply upset over the negative depiction, in general the Mormons present received him warmly. Forms Vehement opposition to the LDS Church comes from individuals or groups associated with the Christian countercult movement, which is mostly an evangelical Christian phenomenon. In the 21st century opposition to Mormonism has become frequent among Secular or New Atheist groups. Religious anti-Mormonism Among those with religious motives, Daniel C. Peterson has identified two major streams of modern anti-Mormon thought. The first is "traditional anti-Mormonism", typified by Rev. Wesley Walters, Jerald and Sandra Tanner, and (to a certain extent) self-proclaimed "Bible Answer Man" and "cult expert" Walter Martin. Anti-Mormons in this category, "anxious to be taken seriously by at least a portion of the scholarly community," generally try to explain Mormonism in naturalistic terms. They appeal to "Joseph Smith's environment and his (wicked or pathological) character, perhaps assisted by a co-conspirator or two", as a sufficient explanation for Mormon origins. "New Age anti-Mormonism", according to Peterson, "is quite different. It admits the presence of supernatural events in the founding events of the Church of Jesus Christ of Latter-day Saints and is quite willing to acknowledge continuous supernatural influence in the life of the Church today." However, "unlike faithful Latter-day Saints, New Age anti-Mormons see the supernatural agents involved in the founding and progress of the Church as demonic, occultic, diabolical, luciferian." This "New Age anti-Mormon" grouping includes Ed Decker, Loftes Tryk, James R. Spencer and many others. According to Introvigne, New Age anti-Mormonism emerged in the 1980s largely as a