Observation of the Day
In the midst of a review of Gold City’s Christmas project, SG blogger Kyle Boering observes:
“Let It Snow” and “Winter Wonderland” are both jazzed up, but without abandoning the quartet feel. Jonathan Wilburn sure seems to have fun with them, too (I’ve always found it interesting when gospel acts include these two songs, as they are essentially secular love songs with a winter theme as opposed to actual Christmas songs).
I have wondered the same thing myself. The best I’ve been able to come up with is that the melody may evoke memories of happy Christmases in the performer’s past. But I’ve still yet to figure out a good answer to the question.
Blame it on whatever you like! Fact is, my reason is simple enough: I have no interest in any secular music. 
(jealous pout)