Religious extremists, like that Xeno guy? I guess if it's played for laughs, it's feasible.
However if it is a group that whose main activity is forceful spreading of a religion (fictional or not), and goes to great lenghts to annoy the heck out of people, believers or non believers, potentially harassing and offending other people, then it's better to keep that idea in the scrapbook and not bring it to the set.