It is now mapped with landuse=religious, implying the entire area is used for religious purposes, like church grounds. There shouldn’t be any landuse tag here. Note that OSM doesn’t really have a distinction between drawing “area” versus a “perimeter” - it is the tags that determine the meaning, and landuse tags apply to the whole enclosed area.
But removing landuse won’t change the fact that it is now tagged as a current boundary. Indicating otherwise in the name isn’t enough. Consider someone who wants to make a map of current parish boundaries over a wide area from OSM data - they can’t read every name to see if the data is current or not, so would wrongly map this as if it is a present day boundary.
It might be worth thinking about your overall aim, e.g. are you going to be mapping a lot of these. OpenHistoryMap has already been suggested, but if you just want to display some limited historic data, another option might be to use a service that allows you to overlay your own data on top of an OSM background, without including it in the public OSM database.