The Armenian Apostolic Church is one of the oldest Christian denominations in the world, tracing its roots back to the early 4th century. It was the first nation to adopt Christianity as its state religion in 301 AD, largely due to the efforts of Saint Gregory the Illuminator. The church follows a unique set of traditions and liturgical practices, distinct from both Roman Catholicism and Eastern Orthodoxy. Armenian Apostolic Christians believe in the teachings of Jesus Christ and the authority of the Bible. The church is organized under a hierarchy led by the Catholicos of Armenia, who serves as the spiritual leader. The faithful celebrate various religious holidays, including Easter and Christmas, with rich cultural traditions that reflect their heritage.