If you control the door you have the power. The inhibiting factors are manageable and overcomeable for many people via evidence-based approaches such as CBT. If you're too polite to close the door on Mormons, I'd suggest the problem is going to be debilitating in other areas of life. Meanwhile, if the hallelujah bloke is offensive to thine ears, cut them off. Or short of that, go to the bar when he plays or at least refrain from joining in. None of these things will destroy us.

There is a level playing field in some circumstances, not in others. Sometimes you have to use whatever tools are available to you to make sure it is as level as you can make it.