I agree - this much I know - Cromwell, and English revolution, and basics of protestantism - I guess, I wasn't ready for practical implications of these ideas - after all, I was more used to European archtecture, that, even protectant, looked different (partly because often it was former catholic churches.) Again, most of the warehouse-like churches I've seen here, in Canada, are built recently - so it is connected to styles and fashions, too.