Same as they would for anything that doesn't fit their doctrine - see the link that I posted at the beginning of the discussion. Satan-inspired Idolatry, it seems.

Yeah, I know that I shouldn't have been surprised at the Ryvita and Ribena Mass, but all my formal religious exposure as a young'un was to High (very High) Anglicanism - it just really hadn't occurred to me that anyone might celebrate the Eucharist with anything other than wafers and (not very nice) wine.

But milk and cookies! That's lovely, but I think that I might be misled by expecting a bedtime story and a kiss goodnight afterwards :)