“It is on his way to Damascus that Saint Paul had an apparition and was converted to Christianism.”
“Christianism prevails in its territory, it has a speculative character of a philosophical kind in the mediterranean countries.”
“He was an Egyptian, and had been converted from philosophy to Christianism.”
Christology
(uncountable) A field of study within Christiantheology which is concerned with the nature of Jesus Christ, particularly with how the divine and human are related in his person.
(countable) A particular theory or viewpoint within the field of Christology, e.g. Chalcedonian Christology, Arian Christology, etc.