Good one Yehuda...
". >)
All:
It's all too simple.
"Church" is any group of believers.
Table, altar, buildings etc are irrelevant.
THE Church is all believers.
So, a "church" is all believers, but what is a "church building" if not a "building". If you wish to discuss the "church" as a metaphysical construct, then do so, but if you wish to discuss "church architecture through the ages", you can do that too. I didn't mix the concepts, but you are doing so.
The only purpose served by such behavior is to create a false sense of self-righteous indignation which enables you to mock Christianity.