also be used in a derived sense to mean "a system of theoretical principles; an (impractical or rigid) ideology." In religion The term theology has been deemed by some as only appropriate to the study of religions that worship a supposed deity (a theos), i.e. more widely than monotheism; and presuppose a belief in the ability to speak and reason about this deity (in logia). They suggest the term is less appropriate in religious contexts that are organized differently (i.e., religions without a single deity, or that deny that such subjects can be studied logically). Hierology has been proposed, by such people as Eugène Goblet d'Alviella (1908), as an alternative, more generic term. Abrahamic religions Christianity As defined by Thomas Aquinas, theology is constituted by a triple aspect: what is taught by God, teaches of God and leads to God (). This indicates the three distinct areas of God as theophanic revelation, the systematic study of the nature of divine and, more generally, of religious belief, and the spiritual path. Christian theology as the study of Christian belief and practice concentrates primarily upon the texts of the Old Testament and the New Testament as well as on Christian tradition. Christian theologians use biblical exegesis, rational analysis and argument. Theology might be undertaken to help the theologian better understand Christian tenets, to make comparisons between Christianity and other traditions, to defend Christianity against objections and criticism, to facilitate reforms in the Christian church, to assist in the propagation of Christianity, to draw on the resources of the Christian tradition to address some present situation or need, or for a variety of other reasons. Islam Islamic theological discussion that parallels Christian theological discussion is called Kalam; the Islamic analogue of Christian theological discussion would more properly be the investigation and elaboration of Sharia or Fiqh. Some Universities in Germany established departments of islamic theology. (i.e. ) Judaism In Jewish theology, the historical absence of political authority has meant that most theological reflection has happened within the context of the Jewish community and synagogue, including through rabbinical discussion of Jewish law and Midrash (rabbinic biblical commentaries). Jewish theology is also linked to ethics, as it is the case with theology in other religions, and therefore has implications for how one behaves. Indian religions Buddhism Some academic inquiries within Buddhism, dedicated to the investigation of a Buddhist understanding of the world, prefer the designation