Alaska has been identified, along with Pacific Northwest states Washington and Oregon, as being the least religious in the U.S. According to statistics collected by the Association of Religion Data Archives, only about 39% of Alaska residents were members of religious congregations. Evangelical Protestants had 78,070 members, Roman Catholics had 54,359, and mainline Protestants had 37,156.

After Catholics and the largest single denominations are Mormons with 28,956, Southern Baptists with 22,959, and Orthodox with 20,000.23.07% of the people in North Slope Borough County, AK are religious, meaning they affiliate with a religion. 3.18% are Catholic; 18.25% are Protestant; 1.30% are LDS; 0.34% are another Christian faith; 0.00% in North Slope Borough County, AK are Jewish; 0.00% are an eastern faith; 0.00% affiliate with Islam.

The largest religious organization in the state is the Roman Catholic Church, which had 54,359 and 102 congregations in 2000. Southern Baptists constituted the largest Protestant denomination, with 22,959 adherents and 68 congregations. Many Aleuts were converted to the Russian Orthodox religion during the 18th century, and small Russian Orthodox congregations are still active on the Aleutian Islands, in Kodiak and southeastern Alaska, and along the Yukon River.