Same here. It seems that they're pretty evenly matched. Also I notice that this is the only time of year where you can hear Christian stations playing secular songs, as they will play the more fun songs as well as the religious.
I have noticed something else that you guys might find interesting, although it's not exactly radio per se. The music played in stores and restaurants definitely leans more toward the secular songs. There was a restaurant we used to go to in Murfreesboro that piped in Christmas music during December. The mix between sacred and secular was about 50/50, but the secular songs had lyrics, while the Christian songs were pretty much always instrumental. I guess it wasn't too unusual as during the rest of the year they played instrumental music in the style of what you would hear on the Weather Channel during the local forecast, but I just thought it was weird that when they were piping Christmas music, which was the only time I remember hearing lyrics in their music, every time a Christian song played it was instrumental. I'm sure they played instrumental versions of the other songs too, ut IIRC while I was there I didn't hear a single Christian song with lyrics.