John Alexander Dowie
, the founder of Zion, Illinois
and a prominent faith healer who influenced Pentecostalism and claimed to be the prophet Elijah (!) in a spiritual sense. Dowie also taught British Israelism. He, like his successor Wilbur Voliva, was a proponent of flat-earth theories.
And to top all that off, he ended up losing a "prayer duel" (mubahala
) to Mirza Ghulam Ahmad
, an Indian from Punjab who himself claimed to be a prophet, the Messiah (in the likeness of Jesus), and
the Mahdi. Dowie had claimed the Christ would destroy the Muslims when he returns, a claim Ahmad obviously found offensive when he became aware of it, so Ahmad challenged Dowie to a "prayer duel" and whoever outlived the other would be considered the winner. Dowie died one year before Ahmad.