I don’t believe the antichrist will be Muslim, quite the opposite, he defeats them.
In prophecy, he is depicted as a warrior going forth to battle (the white horse/first seal). Defeating Islamic terrorism in a great battle, he will be hailed a hero by the world. Jews will see him as their Messiah.
As to Christians, those superficial in the prophetic scriptures, will think him to be a wonderful hero also. And due to their various interpretations of who they believe the antichrist to be, some, most notably the dispensationalists, will believe it impossible for him to be the antichrist.
Once ensconced in the temple at Jerusalem, he will demand an image be made of himself, and a mark imposed on those who believe he is a false Christ, NOT the Messiah. And that, my dear friend, is where the Rev. 14:9-11 passage I posted, and John MacArthur’s interpretation of it comes to the fore.