The millenium is future Prophecy that is correctly taught in Revelation.
Rapture is not complicated.
Have a read of it in the link below then make up your own mind.
https://doctrine.org/the-rapture
Paul teaches the "mystery"
https://doctrine.org/pauls-mystery
Col 1:26 26Eventhe mystery which hath been hid from ages and from generations, but now is made manifest to his saints:
