Believe the Bible, when the false Messiah convinces all but the true believers that he is the real Messiah and Jesus was a fraud... then... you will see a falling away that makes the false prophets and humanists in the pulpits for the last 2000 years seem like holy and devout apostles...
This character will have to convince all the peoples of the world who are devoted to their religions, skepticism, atheism, humanism that he is the savior of the world eventually to claiming he is God above every god.
And Jesus himself said that if it were possible even the very elect would be deceived.
It doesn't take Einstein to figure out that the one group (Christians) who will not believe or follow this guy will become the global
personas non grata. Everything that goes wrong in the world will be blamed on the Christians and our stubborn refusal to bow the knee to the antichrist.
If you think about it... the mark of the beast doesn't have to be complicated. It could be just a symbol a hexagon with six triangles; a six pointed star for example showing the bearer of the mark is en***led to buy and sell because they are a worshiper of the beast.
Because the mark itself will be a simple non technological graphic tracking device / system used to track down the one people on earth who will not accept the mark.
Brother will betray brother to death... this will be the time of the patience of the saints to be faithful unto death.
When it comes down to that big a risk then you will find many falling away.