Maybe tactical alliances with Muslims on some moral issues makes sense, but Christians should definitely reject any appeal to violence similar to Muslim doctrine on jihad.
There is no way one can refute the fact that we as Christians share a common enemy with Islam in the secular PC left. We are constantly complaining about the demise of our value system which made this nation at the hands of the liberals, and it is this same PC ideology that motivates the Jihadists to declare their fatwas against the west.
Remember, Jesus is a prophet in Islam - and history is replete with instances of Muslims defending Christian sites of religious significance. The monastery at the foot of Mt Sinai comes to mind - Mohammed himself declared that no Muslim would allow any harm to come to that place, even during the Crusades - and his personal guard kept watch over the monastery. Muslims put people of faith above those without, regardless of what that faith is. Yes, they still want to kill us all, but they'd kill the secularists first.
It isn't too large a stretch to imagine that if the west were to actually live up to its' religious values instead of what we are seeing today that OBL's movement would wither away and die. They see the west as being "Godless", can you blame them for that? We see them as barbarians due to their lack of placing any value upon human life and their seventh century way of living. There's a lot of educating that needs to be done on both sides about the other.
Once that happens, both sides will see who the true enemy is. The Left.