Church on Saturday? Jesus Christ: Private Investigator? In 1844, after 'The Great Disappointment' of the Millerite movement, Ellen G. White began having visions. Eventually, she was among the founders of a new christian denomination known as the Seventh-day Adventist Church. We'll talk about how their beliefs and practices differ significantly from other Christian churches, and what the heck Jesus is doing up there in his heavenly apartment.