In 2 Thess. 2 verses 6 and 7 it is speaking of the restraining and the restrainer. The commonly held belief is that in order for the Holy Spirit to stop restraining, the Church has to be gone. Why can’t He stop restraining the man of lawlessness just in obedience to the Father’s timing?
Certainly God could just have the Holy Spirit stop restraining the anti-Christ, but that’s not what 2 Thess. 2:7 says. The literal translation indicates the Holy Spirit will be “taken out of the midst” of the lawlessness. Since the Holy Spirit is sealed within the Church, this means we have to be taken too.
By the way, this is consistent with the action God took just before the Great Flood, where He withdrew His Spirit from Earth in advance of the judgment. (Genesis 6:3)