Christians! Jews! Muslims! Atheists! Everyone else! 
The Irrelevant Show has a holiday song just for you.. the Holiday Song, by Ben Sures.

Ben Sures - The Holiday Song

It may not really count as viral but the Holiday Song is clearly coming down with something. WFMT in Chicago has aired the tune on their program The Midnight Special.

AND Edmonton community paper, Millwoods Mosaic has printed the lyrics.