As a member of the LDS Church, Christensen served from 1971 to 1973 as a missionary in Korea and spoke fluent Korean. He served in several leadership positions in the church, including as an area seventy from 2002 to 2009, a counselor in the presidency of the Massachusetts Boston Mission, and as a bishop. His book, "The Power of Everyday Missionaries", was a leading work in the LDS Church on how all people could be involved in sharing the gospel no matter their position in the church. He was also a moving force behind the creation of "For All The Saints", a book by Kristen Smith Dayley on the history of the LDS Church in New England, published in 2012 to which Christensen wrote the foreword.