I'm with Oakleaf - I don't eat pork products for ethical reasons.
I live in the south, but wouldn't have thought to ask about a pie crust. I also would not have been at all upset at the person who brought it. It's ethics not religion for me - but it really wouldn't bother me.
It sucks for people who have severe food allergies. But - I couldn't want someone who is, for example, peanut allergic to eat anything I've cooked. Why? DH and I eat peanut butter and peanuts. There could be trace particles on anything out of my kitchen potentially. I don't know of any food that is completely safe for all people (and certainly not enough of them to fill a buffet table).
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