I think you're right that it reflects evangelicals' failure to recognize the importance of liturgical action.
Though bigotry is a bit strong a term to use for it. More likely, the author simply had little exposure to liturgy, and hence doesn't grasp its importance and spiritual value. I don't think it's fair to read anything sinister into it.
I agree. You'll notice that I called it "unintentional".
They probably assume (wrongly) that we are just "going through the motions."
It's not sinister, its unfortunate.