Church attendance in the context of "Vigil"

A church service (or a worship service) is a formalized period of Christian communal worship, often held in a church building. Most Christian denominations hold church services on the Lord's Day (offering Sunday morning and Sunday evening services); a number of traditions have mid-week services, while some traditions worship on a Saturday. In some Christian denominations, church services are held daily, with these including those in which the seven canonical hours are prayed, as well as the offering of the Mass, among other forms of worship. In addition to this, many Christians attend services on holy days such as Christmas, Ash Wednesday, Good Friday, Ascension Thursday, among others depending on the Christian denomination.

The church service is the gathering together of Christians to be taught the "Word of God" (the Christian Bible) and encouraged in their faith. Technically, the church in "church service" refers to the gathering of the faithful rather than to the physical place in which it takes place. In most Christian traditions services are presided over by clergy wherever possible, but some traditions utilize lay preachers. Styles of service vary greatly, from the Catholic, Lutheran, Eastern Orthodox, Oriental Orthodox, Reformed (Continental Reformed, Presbyterian and Congregationalist) and Anglican traditions of liturgical worship to informal worship characterized by certain free church traditions, common among Methodists and Baptists, that often combine worship with teaching for the believers, which may also have an evangelistic component appealing to backsliders and the non-Christians in the congregation (cf. altar call). Quakers and some other groups have no formal outline to their services, but allow the worship to develop as the participants present feel moved.

The Oxford English Dictionary defines religiosity as: "Religiousness; religious feeling or belief. [...] Affected or excessive religiousness". Different scholars have seen this concept as broadly about religious orientations and degrees of involvement or commitment. The contrast between "religious" and "religiose" (superficially religious) and the concept of "strengthening" faithsuggest differences in the intensity of religiosity.

Scholars attempt to measure religiosity at the levels of individuals or groups, but differ as to what behaviors constitute religiosity. Sociologists of religion have observed that an individual's experience, beliefs, sense of belonging, and general behavior often are not congruent with their religious behavior, since there is much diversity in how one can be religious or not. Problems arise in measuring religiosity. For instance, measures of variables such as church attendance produce different results when different methods are used, such as traditional surveys as opposed to time-use surveys.

The Bible Belt is a region of the Southern United States and the Midwestern state of Missouri (which also has significant Southern influence), where evangelical Protestantism exerts a strong social and cultural influence. The region has been described as the most socially conservative across the United States due to a significant impact of Protestant Christianity on politics and culture. The region is known to have a higher church attendance, more evangelical Protestant denominations, and greater emphasis on traditional religious values compared to other parts of the country. The region contrasts with the religiously diverse Midwest and Great Lakes and the Mormon corridor in Utah, southern Idaho, and northern Arizona.

Whereas the states with the highest percentage of residents identifying as non-religious are in the West and New England regions of the United States (with Vermont at 37%, ranking the highest), in the Bible Belt state of Alabama it is just 12%, while Tennessee has the highest proportion of evangelical Protestants, at 52%. The evangelical influence is strongest in Alabama, Georgia, North Florida, Mississippi, Arkansas, Tennessee, Kentucky, southern Missouri, Western North Carolina, the Upstate region of South Carolina, Oklahoma, North Louisiana, northern and eastern Texas, southern and western Virginia, and West Virginia.

Saint Sylvester's Day, also known as Silvester or the Feast of Saint Sylvester, is the day of the feast of Pope Sylvester I, a saint who served as Pope from 314 to 335. Medieval legend made him responsible for the conversion of emperor Constantine. Among the Western churches, the feast day is held on the anniversary of Saint Sylvester's death, 31 December, a date that, since the adoption of the Gregorian calendar, has coincided with New Year's Eve. For these Christian denominations, Saint Sylvester's Day liturgically marks the seventh day of Christmastide. Eastern churches celebrate Sylvester's feast on a different day from the Western churches, i.e. on 2 January. Saint Sylvester's Day celebrations are marked by church attendance at a Watchnight Mass that is often held around midnight, as well as fireworks, partying, and feasting.