structural:scholar_edition, structural:expansion, structural:reformatting
Religion

New Orleans' colonial history of French and Spanish settlement generated a strong Roman Catholic tradition. Catholic missions ministered to slaves and free people of color and established schools for them. In addition, many late 19th and early 20th century European immigrants, such as the Irish, some Germans, and Italians were Catholic. Within the Roman Catholic Archdiocese of New Orleans (which includes not only the city but the surrounding parishes as well), 40% percent of the population was Roman Catholic since 2016. Catholicism is reflected in French and Spanish cultural traditions, including its many parochial schools, street names, architecture and festivals, including Mardi Gras. Within the city and metropolitan area, Catholicism is also reflected in the Black and African cultural traditions with Gospel Mass.

Influenced by the Bible Belt 's prominent Protestant population, New Orleans also has a sizable non-Catholic Christian demographic. Roughly the majority of Protestant Christians were Baptist, and the city proper's largest non-Catholic bodies were the Southern Baptist Convention, the National Missionary Baptist Convention of America, non-denominationals, the National Baptist Convention, the United Methodist Church, the Episcopal Church, the African Methodist Episcopal Church, the National Baptist Convention of America, and the Church of God in Christ according to the Association of Religion Data Archives in 2020.

New Orleans displays a distinctive variety of Louisiana Voodoo, due in part to syncretism with African and Afro-Caribbean Roman Catholic beliefs. The fame of voodoo practitioner Marie Laveau contributed to this, as did New Orleans' Caribbean cultural influences. Although the tourism industry strongly associated Voodoo with the city, only a small number of people are serious adherents.

New Orleans was also home to the occultist Mary Oneida Toups, who was nicknamed the "Witch Queen of New Orleans". Toups' coven, The Religious Order of Witchcraft, was the first coven to be officially recognized as a religious institution by the state of Louisiana. They would meet at Popp Fountain in City Park.

Jewish settlers, primarily Sephardim, settled in New Orleans from the early nineteenth century. Some migrated from the communities established in the colonial years in Charleston, South Carolina and Savannah, Georgia. The merchant Abraham Cohen Labatt helped found the first Jewish congregation in New Orleans in the 1830s, which became known as the Portuguese Jewish Nefutzot Yehudah congregation (he and some other members were Sephardic Jews, whose ancestors had lived in Portugal and Spain). Ashkenazi Jews from eastern Europe immigrated in the late 19th and 20th centuries.

By the beginning of the 21st century, 10,000 Jews lived in New Orleans. This number dropped to 7,000 after Hurricane Katrina, but rose again after efforts to incentivize the community's growth resulted in the arrival of about an additional 2,000 Jews. New Orleans synagogues lost members, but most re-opened in their original locations. The exception was Congregation Beth Israel, the oldest and most prominent Orthodox synagogue in the New Orleans region. Beth Israel's building in Lakeview was destroyed by flooding. After seven years of holding services in temporary quarters, the congregation consecrated a new synagogue on land purchased from the Reform Congregation Gates of Prayer in Metairie.

A visible religious minority, Muslims constituted 0.6% of the religious population as of 2019 according to Sperling's BestPlaces. The Association of Religion Data Archives in 2020 estimated that there were 6,150 Muslims in the city proper. The Islamic demographic in New Orleans and its metropolitan area have been mainly made up of Middle Eastern immigrants and African Americans.