Ahem. The Catholilc church and Christianity were one and the same until the schisms and later the Reformation.
The Catholilc church and the Baptist church and the Presbyterians church and Christianity were one and the same until the schisms and later the Reformation.
That's what I'm saying...The Catholic church, the Baptist church, the the Presbyterian church etc. all had the same roots...
When Constantine declared a state religion, one group went that way and the others went another...The schisms apparently started before Constantine...So if this building is older than Constantine's reign, it's hard to say who it belonged to...