It really is comparable to the Jews waiting for their literal Messiah who was going to usher in their literal kingdom. Well the Messiah was literal, but He was also Spiritual, but as He told them, the kingdom is spiritual,not of this world, yet here they are still today,going to build that temple and they've convinced many Christians, that the kingdom is earthly.
I do not get in the slightest how Christians can think building that third temple makes sense for Chrisianity. Let the lost build whatever they want. But Christians should preach the Gospel to all men for the saving of their souls by the third and final temple, Jesus Christ.