“A recent study in the Journal of Marketing Communications found that men with beards were deemed more credible than those who were clean-shaven. The study showed participants pictures of men endorsing certain products. In some photos, the men were clean-shaven. In others, the same men had beards. Participants thought the men with beards had greater expertise and were significantly more trustworthy when they were endorsing products like cell phones and toothpaste. But, oddly, men with beards were slightly less effective than smooth-cheeked fellows in underwear advertisements.”
Alas, the study says nothing about preacher types.
Found at C.H.E.