Bodley's Librarian 

 Adaptively Reused churches and Former churches 

Hi Bencherlite, 
I've distinguished "Adaptively Reused churches" from "Former churches" because former churches could refer to any church building no longer used as a church, which would include demolition, closure, abandonment, ruin, etc. Adaptively Reused is an historic preservation / architectural conservation term for the reuse of a structure. For churches, this would include continuation as a church but for a different Christian denomination. Hope this clarifies that neither category is really a subcategory of each other, although they do heavily overlap. 
I believe some mistake were made. Thank you for catching the St. Cross and Hove articles 
Adaptive Reuse is the standard term in the architectural conservation / historic preservation / restoration industry, used as a keyword in nearly every publication on the subject.