I just thought the same thing reading this. Not as in depth as you did.
However the mark of the beast will allow no one to buy or sell without it. I assume this means every one on Earth and it’s unlikely that any muslim country would ever go for that.
You’re right. I was too closely relating the mark with the AOD I guess. However on your point it is interesting that everybody on earth will follow the beast except those written in the book of life. So that means even atheists will worship the same entity certain other religions are following at the time.
“All who dwell on the earth will worship the beast — all whose names have not been written from the foundation of the world in the book of life of the Lamb who was slain.”