The only way to know for sure is to actually be present during The Great Tribulation and Reign of Anti-Christ. No one in their right mind would willingly volunteer for that if they did not have to. Perilous Times.
lol.... Its beginning to look like most Christians won't even know that the reign of the antichrist began in 325 ce until Jesus returns to destroy it.
and then they'll probably think that he's the antichrist.
Francis refuses to admit it