1) Christian term 
Christianism had various definitions over the years. It was originally defined as `the Christian religion` or `the Christian world`, with cognates in languages like Spanish (cristianismo) or French (christianisme) retaining this meaning. In recent years, Christianism (or Christianist) has also been used as a descriptive term of Christian polit...
• (n.) The Christian world; Christendom. • (n.) The Christian religion.
Chris`tian·ism noun [ Latin christianismus , Greek ...: confer French christianisme .] 1. The Christian religion. [ Obsolete] Milton. 2. The Christian world; Christendom. [ Obsolete] Johnson 
another name for Christianity, the monotheistic religion recognizing Jesus Christ as its founder and central figure. With more than two billion adherents, or about one-third of the total world population, it is the largest world religion. Its origins are intertwined with Judaism, with which it shares much sacred lore, including the Old Testament (H...
the beliefs and practices of Christians.