The doctrine of the Immaculate Conception states that the Virgin Mary was conceived without original sin. The Catholic Church, particularly the Latin Rite, follows the doctrine of the Immaculate Conception, which states that Mary was conceived without original sin. Other denominations that follow it include some Anglicans and Eastern Orthodox Churches, though the understanding and formulation differ, and many other Protestant denominations do not accept the doctrine. The Immaculate Conception is celebrated annually on December 8th as a solemn feast day, whose observance began with a Papal encyclical by Pope Pius IX, when he formally defined the dogma of the Immaculate Conception in 1854. 

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Audio credits: Truth Unites podcast with Gavin Ortlund-The Immaculate Conception, A Protestant Appraisal (Aug. 31, 2023); Saint of the Day with Mike Roberts (Solemnity of the Immaculate Conception Dec. 9, 2024); Saint of the Day: The Conception of the Most Holy Mother of God by Deacon Jerome Atherholt and Ancient Faith Ministries (20jul2025). Audio excerpts reproduced under the Fair Use (Fair Dealings) Legal Doctrine for purposes such as criticism, comment, teaching, education, scholarship, research and news reporting.