Yes, if If there is no service going on in the facility, it is not an `amenity=place_of_worship`. As there is a community coming together, it is an `amenity=community_centre`, which can be further qualified with `community_centre=parish_hall` or `community_centre=church_hall` if you like.
That prevents further key fragmentation, is religion-neutral for the high-level key, and `amenity=community_centre` is rendered in mapnik/carto already. The proposal for amenity=church_hall has been abandoned in 2012 and found only few taggers.