See, I think this provides a service to us. It may have been intended to accomplish the malevolent goals you suggest (to make traditional American Christianity look bad), but I think this is an opportunity for us to re-evaluate and ask if we go too far in the hard sell to our kids? Do we actually brain-wash them in an attempt to make sure they are converted? Or do we rather asssist them with a relational discipleship model, coming alongside of them and helping them think through the intersection of their faith and their life?
If the film is accurate - and at this time, there is no evidence to suggest it is not - then, as a conservative Christian I must say they provided a service: they identified a dangerous element within our own ranks. The pastor on that trailer sounded mentally unhinged, and assuming no editing shenanigans went on, she could quite easily become a Christian fundamentalist terrorist. It's time to police our own.
I agree substantially. However, The point of the film, politically, is to morally equate Islamic fundamentalism with Christian fundamentalism.
Let religions believe and say what they want to. Violence is the dividing line.