LARadioRewind says >>>very few Christian Christmas songs get played nowadays, not on FM radio and not on Sirius XM's seasonal Christmas channels. Songs about Santa and bells and sleighs and reindeer and trees have replaced Silent Night, O Holy Night, Away In A Manger and O Little Town Of Bethlehem. <<<
Actually the opposite is true. Radio stations (that weren't religious) never used to play Christmas hymns before Dec. 24. It was all Snoopy's Christmas and Marshmallow World till Christmas Eve. Only then was the religious music aired. That changed in 1984 when the album "A Very Special Christmas" raising money for Special Olympics came out. Various artists contributed songs and from Stevie Nicks came "Silent Night" and from Sting came "Gabriel's Message." Radio stations didn't want to ignore these religious Christmas songs till Dec. 24, so the rule that you only play secular Christmas music till Dec. 24 was broken.
Today, there are plenty of religious Christmas songs included in KOST and other AC station playlists when they go All-Christmas. Several versions of O Holy Night, by Josh Grobin, Celine Dion and Mariah Carey get included. Hark The Herald Angels Sing from Carrie Underwood, We Three Kings from Anne Murray, O Come All Ye Faithful from Lionel Richie and other hymns are heard. Maybe in the early weeks it's only one or two per hour, but as we get closer to Dec. 25, more religious music is added. The other day I heard on WLTW NYC (like KOST an iHeart AC station) Nat King Cole doing "Adeste Fidelis" sung in Latin. Can't get any more religious than that!