In Christianity, a church service is a term used to describe a formalized period of worship, often but not exclusively occurring on Sunday, or Saturday in the case of a church practicing Sabbatarianism. The church service and its conduct is seen as being a primary, although not the sole, purpose for the existence of the church. Christianity is an Abrahamic religion based on the life, teachings, death by crucifixion, and resurrection of Jesus of Nazareth as described in the New Testament. ... Worship usually refers to specific acts of religious praise, honour, or devotion, typically directed to a supernatural being such as a god or goddess. ... Sunday is the day of the week between Saturday and Monday, and the second day of the weekend in some cultures. ... Saturday is the day of the week between Friday and Sunday. ... Sabbatarianism can refer to either: The practice of observing the seventh day (Fridays sunset to Saturdays sunset) as the Sabbath. ...

Styles of service vary greatly, from the Roman Catholic and Eastern Orthodox traditions of liturgical worship to the evangelical Protestant style, which often combines worship with an outreach to non-Christians and/or non-practicing Christians in the audience. The Roman Catholic Church, most often spoken of simply as the Catholic Church, is the largest Christian church, with over one billion members. ... Eastern Orthodoxy (also called Greek Orthodoxy and Russian Orthodoxy) is a Christian tradition which represents the majority of Eastern Christianity. ... From the Greek word λειτουργια, which can be transliterated as leitourgia, meaning the work of the people, a liturgy comprises a prescribed religious ceremony, according to the traditions of a particular religion; it may be refer to, or include, an elaborate formal ritual (such as the Catholic Mass), a daily... Evangelical has several distinct meanings: In its original sense, it means belonging or related to the Gospel (Greek: euangelion - good news) of the New Testament. ... Protestantism is a general grouping of denominations within Christianity. ...