Another reason
I'm not religious by any stretch but I just read another reason to avoid the whole issue:
I went to a Lutheran grade school for two years and we were told all about about "this is my blood" and "this is my body" and I don't remember anyone mentioning that it was symbolic. I was young and didn't realize what we were doing at the time. I know Catholics/Lutherans/etc have a great rationalization behind the whole thing and next time religion comes up I'll see what "the believers" think.
Sheldon