I think Islam could very well be the harlot (which Revelation indicates is the false religious system). I may be wrong, but it seems so to me because of the talk of beheadings in Revelation, and because there is supposedly a poweful false prophet who backs the antichrist (whonever he may be).
I think you may have a point....In Revelations it is mentioned that even some of the elect are deceived by this religion. For the Moslems, to fall down and bow to another religion is not an option. Weak Christians are more susceptible to succumbing new religions. The army of 200 million that battles at Armageddon is also more likely coming from a unified Islamic movement. I remember growing up that China was mentioned as being the one that supplies the 200 million...the tide has turned.
The bad news is the US doesn't show up in the Revelations unless we are the Babylon that gets wiped out in 30 minutes....