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Did you mean Harold Camping? (he’s dead)
All of the churches mix truth with falsehood.
We are called out of All of the churches, not just some of them.
The believers are mostly not a part of the churches today. They come together in various ways in small impromptu meetings. The “Mystery of Iniquity” has not trapped them.
They do not all agree completely, but they all recognize that blanket of rejection of God’s commandments that characterizes the organized corporate churches.
Revelation 3:3 is the warning for the ‘churches.’
Yeshua’s assembly are not a church; they are a mystic, invisible body. Some of them may well be in your church, but they have no characteristic marking to identify them (yet).
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There are good churches. Granted, they are few and far between, but they are out there for those who love truth. They will remain until they are taken out of the way in the Rapture...the gates of hell will not prevail.