described three postulates which theology does not comply with, to show that it is not possible to have a rational debate about religion. According to Hedenius this means that theology can not be classed as knowledge, but belongs outside it as "quasi-knowledge": The religion-psychology postulate: A religious belief contains metaphysical assumptions which science can neither verify nor falsifyfor example, assertions of the existence of God, or the immortality of the soul. The language-theory postulate: It must be possible to communicate the religious comprehension and experience even to non-believers. The logic postulate: Two truths cannot contradict each other. Of two contradictory statements, at most one can be true. Theology not only contains theses which contradict what we know about reality (contrary to the religion-psychology postulate) but also accepts inner contradictionsfor example, the oldest and according to Hedenius also insoluble problem of evil. Hedenius was of the opinion that Christianity violates these rules and is therefore irrational. Amongst other things, he proposed that the study of religions and their development should be separated from theology and become a non-religious academic discipline. Works Om rätt och moral (1941) Om praktisk filosofi (1948) Tro och vetande (1949) Att välja livsåskådning (1951) Tro och livsåskådning (1958) Helvetesläran (1972) Samtal med Ingemar Hedenius (in part with Sven Ragne Carlson) (1975) References 1908 births 1982 deaths People from Uppsala Municipality Academic staff of Uppsala University Critics of Christianity Swedish atheists Swedish atheism activists Burials at Uppsala old cemetery Analytic philosophers 20th-century Swedish philosophers