Visiting churches in Elden Ring Nightreign is crucial during the first two nights to interact with altars and increase charges for Flask of Crimson Tears.
There are three to four churches per run in Limveld, with predetermined spawn locations that vary each run.
Church spawn points can differ in various runs, and there is no predetermined rotation pattern for their locations.
During The Crater Shifting Earth event, four churches spawn, while typically it's either three or four churches in Elden Ring Nightreign.