The most important Christian religious Christian practices are the sacraments rites or ceremonies regarded as instruments or symbols of spiritual benifit from Christ to the worshipper.
The Holy Scripture for Christians is called the Bible (which consists of an Old Testament (shared with Judaism) and the New Testament (which includes the life and teachings of Jesus).
The Holy day in the Christian Church is Sunday. On this day worshippers congregate in churches. In most, but not all churches, there is the singing of hymns, prayers, scripture reading and talks (most often by the clergy of the church).