Hmm, good question, though I never really thought about it. I did wonder what a Christian-looking church (architecturally, it looks like the church I used to go past on the bus when I lived in South East London) was doing in a Japanese video game (where Christianity is a minority religion), so like Yliette I assumed it was a Christian church, but since it was disused and in disrepair, nobody used it. However Aeris believed it was a 'holy' place, so maybe it is a building left over from the Cetra days, which is no longer used by the general population.

BTW, Buddhism and Judaism refer to their places as 'temples'. Only factions of Christanity, and relatively new religions (e.g. Scientology) refer to their places of worship as a church. At least I think so...