Soul sleep

Christian mortalism incorporates the belief that the human soul is not naturally immortal; and may include the belief that the soul is uncomprehending during the time between bodily death and resurrection, known as the intermediate state. "Soul sleep" is an often pejorative term so the more neutral term "materialism" was also used in the nineteenth century, and "Christian mortalism" since the 1970s.

Historically the term psychopannychism was also used, despite problems with the etymology and application. The term has also been used, for example Gordon Campbell (2008) identified Milton as believing in the latter though in fact both De doctrina Christiana and Paradise Lost refers to death as "sleep" and the dead as being "raised from sleep". The difference is difficult to identify in practice.

Related and contrasting viewpoints of life after death include universal reconciliation, where all souls are immortal (or are mortal, but universally given continuance) and eventually are reconciled, and special salvation, where a positive afterlife is exclusively held by just some souls. Christian mortalism has been taught by several theologians and church organizations throughout history while also facing opposition from aspects of Christian organized religion. The Roman Catholic Church condemned such thinking in the Fifth Council of the Lateran as "erroneous assertions". Supporters include the sixteenth-century religious figure Martin Luther and the eighteenth-century religious figure Henry Layton among many others.

Since the phrases "soul sleep" or "soul death" do not occur either in the Bible or in early Anabaptist materials, an explanation is required for the origin of the term. Additionally several other terms have been introduced relating to the view. Modern theologians have used the term "Christian mortalism" and related wordings from the 21st century onwards.

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