"The Gospel According to Peanuts" is the title of a bestselling Christian book that teased out the sometimes not-so-latent Christian message of Charles Schulz' classic strip.  As evidence of the extent to which some people identify Peanuts with a Christian witness, check out the Christmas displays at Plymouth Lights, which use a Peanuts nativity and a preaching Linus "to help spread the real meaning of Christmas."  

Hallmark has also sold Christmas decorations on the Peanuts nativity theme, although presumably for more mercenary reasons:

UPDATE:  The 2000 Year-Old Virgin Dept.

A quick follow-up on the Peanuts nativity, with Lucy as Mary and Charlie Brown as Joseph.  I was wondering why Schroder didn't play Joseph until I remembered this--and then realized that if God was going to command anyone to marry a perpetual virgin, Charlie Brown would have to be the guy.

Good grief!