I’m not so sure people would notice other people missing. Considering the devilish stronghold on the media and social media networks they could easily brush it off or as a favorable happening for the rest of the world.
I think it will be noticed, but I do agree that it will be spun as a good thing.
However, according to Scripture, many, many individuals will come to Christ during the Tribulation period. It will be far harder for them than for us, though.