OP asked about religion....it is a retelling of the Bible story of Jesus' birth....so by that it obviously is religious.....however it's not a church service where a lot more things are included, there is no sermon, no preaching, no fire and brimstone. The songs tend towards the Jesus Christmas songs....no Jingle Bells or Santa Got Runover, lol.
You are paying a premium for the meal.....the people sitting at the table next to you could be eating the same thing and paying slightly less and not getting tickets to the show.
I grew up in a Christian family.....but have moved a bit away from Christianity, though more the people in churches, not to the point that I don't believe there is a higher power. I don't do well with sermons, preaching, pious only on Sunday.... and I don't do brimstone.....but Candlelight Processional is a must for my family each year. We pick one narrator and buy the lunch package for that one so we have a seat and can see and enjoy the spectacle of the choir, but we have been known to go sit near enough to hear for other narrators. Each narrator puts their own personality in the reading....some we liked, some we decidedly did not. Gary Sinse, Neal Patrick Harris, Levar Burton, Jodi Benson....favorites.