Since Obama helps them, as their now unofficial leader, will he eventually go over there as their Muslim messiah, the anti Christ?
No, the Muslim anti-Jesus it supposed to appear suddenly, similar to how the real Jesus will:
“His Descension
He will descend on a Jamaat (group) that will be righteous at the time and comprising of 800 men and 400 women. The people will be preparing for war at the time against Dajjal (the anti-Christ). It will be time for Fajr prayers, and Imam Mahdi will be the Amir (leader). From the darkness of the dawn, a sound will suddenly be heard that “one who listens to your pleas has come” — the righteous people will look everywhere and their eyes will fall on Isa (A.S.). Briefly, at the time of Fajr, Isa (A.S.) will descend. When descending, Isa (A.S.)’s hands will be on the shoulders of two angels (according to another source (Kab Abrar), a cloud will carry him). On their insistence Hadhrat Isa will introduce himself. He will inquire about their enthusiasm and thoughts on Jihad against Dajjal. Hadhrat Isa (A.S.) will descend on the eastern side near the Minaret in Damascus (or in Baitul-Muqaddus by Imam Mahdi).”
http://www.islam.tc/prophecies/jesus.html
That’s the Shia version, but he Sunni version is almost the same, except they don’t believe that the Imam in the story is the Mahdi.