I’d agree with the thrust here but the closing line is challenging – “nothing worthwhile” is a strong claim. I fully reject their underlying theology, but I do remember seeing a bunch of them out on a street corner preaching and feeding people some years ago. The feeding is a good thing in itself…and the fact that the were out there doing that and preaching was something that made me think critically about my own faith and community – why aren’t WE doing that? God does not make evil, but often draws good out of evil…we can, if we are mature in our faith and careful, recognize good things in others’ beliefs or practices while rejecting that which is false (and being careful to reject the more subtle falsehoods).
I raise this because it ties to an idea prominent in Christian thought (Augustine for example) that evil is a privation, a corruption of some good thing.