High Quality Content by WIKIPEDIA articles! The Church of Christ, Scientist was founded in 1879 in Boston, Massachusetts, USA, by Mary Baker Eddy. She was the author of the book Science and Health with Key to the Scriptures. Christian Science teaches that the "allness" of God denies the reality of sin, sickness, death, and the material world. Accounts of healing through prayer are common within the church and adherents traditionally refuse medical treatment. The church, headquartered in Boston, has a worldwide membership of about 85,000.