>>17929812 (OP)
the Jehovah’s Witnesses started as an apocalyptic cult preaching that the second coming would happen in 1878, and since them they also tried to claim that it would happen at 1914, 1925 and at 1975, and they still exist
Early christians just "reinterpret" the scripture to be Jesus returning in their generation to "actually Jesus will return one day and resurrect everyone" or it's "technically that generation still because theirs a immortal jew roaming the desert somewhere" or "when Jesus said generation he actually meant the whole nations he preached to"
They did that because early christianity was a cult that demanded you to cut ties with non christians, sell your stuff and give the money to the "community/church", admitting they were wrong and Jesus wasn't coming would mean that they did all that for nothing (and that isn't even counting people like Origen that castrated himself for Jesus)