establishment of qualification. Ernest Troeltsch accepted Weber's definition but added the notion of a varying degree of accommodation with social morality: the church is intrinsically conservative, inclined to seek for an alliance with the upper classes and aiming at dominating all elements within society, while the sect is in tension with current societal values, rejects any compromise with the secular order and tends to be composed of underprivileged people. Subsequent sociological and theological studies elaborated on Weber's and Troeltsch's typologies incorporating them into a theory of the church-sect "continuum" or "movement". H. Richard Niebuhr viewed religious groups as ranging between the poles of the sect and the church: sects are protest groups that break away from the church in search of more authentic religious experiences. Sects are inherently unstable and as they grow they tend to become church-like; once they have become established institutions, marked by compromise and accommodation, they are in turn exposed to new schismatic challenges. The sect is a result of "the religious revolts of the poor," and the driving force of the cyclical movement between sect and church is not so much doctrinal controversy as social stratification and conflict taking place along class, race, ethnicity and sectional lines. Other scholars enriched the typology with subtypes. Howard Becker introduced a continuum of types ranging from the cult to the sect, the denomination and the ecclesia, and John Milton Yinger delineated a sixfold typology: the universal church (e.g., the Roman Catholic Church), the ecclesia, by which he meant established national churches (e.g., the Church of England, the Russian Orthodox Church), the denomination (e.g., Baptists, Presbyterians), the established sect (e.g., Seventh-Day Adventists, Quakers), the sect (e.g., many Pentecostalists, the Worldwide Church of God) and the cult (e.g., The Family, Scientology). Benton Johnson simplified the definition of sect and church and based it on a single variable: the degree of acceptance of the social environment. A church is a religious group that accepts the social environment in which it exists, a sect is a religious group that rejects it. The church-sect typology and the notion of a church-sect continuum or movement from the sect to the church came under strong attack in the sociology of religion of the 1960s onwards. The theory suffered from lack of agreement on the distinguishing features, from proliferation of new types and from questionable empirical evidence on its core assumptions. Many contributions to the debate