the Greek of St Paul doesn’t translate to anything like buildings, at best it’d be congregations. This dog is straw.
The fact is that numerous remenants of New Testament era Christian communities (who were hiding from Roman persecutors) left behind a WEALTH of evidence as to how they practiced their faith and it’s utterly at odds with the protestant understanding (based on misinterpretations and misrepresentations of books written in that time, assembled by the Apostolic church [in the presence of the Holy Spirit] hundreds of years before angry west europeons decided they knew better than the church Christ established.)
You can hardly blame us. We got tired of waiting for the Orthodox to write something down.