Everyone knows those are two different events but what you don't understand is they happen the same day.
"for that day shall not come" Paul is speaking of a single day not two different days like you believe.
You are also sidestepping the fact that Paul said the gathering to Christ happens after the man of sin is revealed. That makes pre-trib impossible.
I have already shown you that the Church is raptured BEFORE the anti-christ is revealed!
What do I have to do for you to see that? Clearly the Church is taken out of the way before the anti-christ can be revealed.