Fully understanding the mysteries of God’s apocalypse is not required for salvation. Belief in Jesus Christ—the only name given under heaven whereby men may be saved—IS.
God will not “send a powerful delusion” to ANY believer, regardless of their errant prophetical musings. They love the truth and are thus saved, unlike those who do not love the truth and “will believe the lie”. The Father does not play silly Gotcha! games with his children, as we are kept by Him in His beloved Son.
If you believe the rapture must take place BEFORE the mark of the beast, and you take it believing this cannot possibly be the mark, then you will damn your soul for all eternity.
If you are not open to the possibility that your pretrib rapture could be wrong, RE: my last post, it most assuredly WILL become a matter of salvation.
Amen!