Mary Baker Eddy
From RationalWiki
Mary Baker Eddy (1821-1910) wrote Science and Health with a Key to the Scripture, the guidebook to Christian Science. It claimed that, by understanding how we were merely the reflection of God, we could remove our injuries and diseases. She did not quite believe that things such as disease did not exist, as is often said, merely that spiritual methods were preferable to rational ones.
In many ways, the Church she founded is the largest collection of faith healers on the planet.