"The "spirituality" of Christianity is an acquired taste to which the vast majority of the world has no attraction."

You may want to rethink that assumption:

 "Across Canada, immigrants and visible minorities are much more likely to be religiously committed. Visible minorities made up 16 per cent of the sample group but accounted for 29 per cent of all religiously committed respondents.

http://news.nationalpost.com/news/canada/canadians-may-be-vacating-the-pews-but-they-are-keeping-the-faith-poll

http://news.nationalpost.com/news/religion/ray-pennings-it-is-time-to-change-the-narrative-around-religion-in-canada