The Bible says the Antichrist will be called the Assyrian, will come out of the people who destroyed the Temple, and will deny the God of his fathers. The 12th Imam bears a very striking resemblance to the rider on the white horse. So maybe the Antichrist is an ethnic Jew, born in or around Syria, gained political power in western Europe, and converted to (or at least appeared to do so) to Islam. Or, and much more likely, he'll be someone no one saw coming even with some foreknowledge of his background.
That Christ may dwell in your hearts by faith; that ye, being rooted and grounded in love, may be able to comprehend with all saints what is the breadth, and length, and depth, and height;
"It is by faith alone we are saved, but not by faith which is alone."