the history of....

The word theology comes from late middle English, from French théologie, from Latin theologia, from Greek θεολογία, theologia, from θεός, theos or God + λόγος or logos, "words," "sayings," "discourse," or "reason" ( + suffix ια, ia, "state of," "property of," "place of"). The Greek word can be literally translated as "talk about God or the divine," but the meaning of the word shifted as it was used (first in Greek and then in Latin) in European Christian thought in the Patristic period, the Middle Ages and Enlightenment, and then taken up more widely.

Averroes, like many important Muslims who wrote about God, was a writer on Islamic theology or "Kalam." His school of Averroism had a significant influence on Christian theology.

"Theology" can also now be used in a derived sense to mean "a system of theoretical principles; an (impractical or rigid) ideology."

The term θεολογια theologia is used in classical Greek literature, with the meaning "discourse on the gods or

cosmology." The first known use is by Plato in The Republic, Book ii, Ch. 18.

Aristotle divided theoretical philosophy into mathematike, physike and theologike, with the latter corresponding roughly to metaphysics, which, for Aristotle, included discussion of the nature of the divine.

Drawing on Greek sources, the Latin writer Varro influentially distinguished three forms of such discourse: mythical (concerning the myths of the Greek gods), rational (philosophical analysis of the gods and of cosmology) and civil (concerning the rites and duties of public religious observance).

Taken from : http://en.wikipedia.org/wiki/Theology