Response
I've often wondered how the whole world could so easily accept the Mark of the Beast, when its so clearly spelt out in the Bible. My only conclusions were that it would be forced upon everyone. When people are faced with No job, No income, No Bank Account, No internet, No Mobile Phone, No shopping at Shops for Food, etc etc, plus probably being Branded as a Terrorist, would be enough motivation in my eyes for people to ignore the Bible and just take the Mark.
But maybe you're right - perhaps it will be very subtle, more reason to be on guard and to keep your eyes open.
Another possibility is perhaps the Anti-Crist Leader will claim He is a Christian and in so doing deceive many into receiving the Mark, or even worse maybe the "prostitute" or "mystery babylon" as stated in Revelation will turn out to be the catholic church or some world church and they will endorse the Mark as being different to whats stated in the bible.
I can imagine if the Pope supported the Anti Christ Leader's Mark (which I believe He would do) then His influence over many christians would be strong.