And another theory is that all the prophecies concerning His Second Coming are to be spiritually interpreted, that there is no literal Coming.

...............This would destroy the truthfulness of God's Word and give it no effect; like the belief of the Jews when they spiritualized the prophecies of His First Coming which were literally fulfilled.

..........If the Bible was literal of His First Coming, it has to be literal of His Second Coming.

Read Luke 1:31 & 1:32-33