During a debate held in 1942 against Otis Gatewood (Campbellite), Kenneth E. Farnsworth (LDS) taught that there were 800, not 20,000+ faiths/denominations within Christianity:
Now I'm going to quote it and let
you judge for yourself which of us is right. "And he gave some apostles,
and some prophets and some evangelists and some pastors and teachers for the
perfecting of the Saints and the work of the ministry and for the edifying of
the Body of Christ till we all come to a unity of the faith, unto a perfect
knowledge of the Son of God, unto a perfect man." If we have arrived at
that, then they're certainly done away with, but I am sure we haven't. We
have about 800 different faiths-more than that- and we're far from a unity of
the faith. We're far from a perfect knowledge of the Son of God, even
though the revelations of the Lord are able to make them known. We're far from
that. (Kenneth E. Farnsworth, “The Bible: Complete and Final: Second Negative,”
in Gatewood-Farnsworth Debate on “Mormonism” [Salt Lake City: Otis Gatewood,
1942], 164, emphasis in bold added)
