Praise the Lord and Trim the Hedges

One thing I don't get (yet) about Thailand is the number of classifieds in Chiang Mai either requesting, or advertising, specifically Christian staff.  If we're talking about a babysitter, or even a housekeeper, perhaps, I can understand wanting someone who's that close to your household to share your faith.  But what's up with the number of Christian gardeners offering their services?  I am 99% sure the weeds don't particularly care.