so, why would a guy that believes that there is current war being waged between christians and muslims be supportive of mr. mccain?
well, john wants to destroy iraq. he also wants to destroy iran. he pretty much hates anyone that isn't american.
so...rod meets john, they talk, and they realize that they are both fascist dicks, so naturally, they become buddies. so, when john decides to try and take over america, he calls on rod, his trusted fascist buddy to continue brainwashing the masses with his bullshit, but also to add a little bit of mccainism in to his sermons.
here's a much better written article on the subject:
http://motherjones.com/washington_dispatch/2008/03/john-mccain-rod-parsley-spiritual-guide.html
WE SHALL OVERCOME.