Don’t forget that reversed stupidity is not intelligence; a belief doesn’t become wrong simply because it’s widely held by Catholics.
Similarly, there’s no need to be scared of responding positively to art or other ideas because they originated from a religious perspective; if atheism required us to do that, it would be almost as bleak a worldview as it’s accused of being. Adeste Fideles doesn’t stop being a beautiful song when you realize its symbols don’t have referents. I think of the Christian mythology as one of my primary fantasy influences—like The Lord of the Rings, Discworld, The Chronicles of Thomas Covenant or Doctor Who—so, if I find myself reacting emotionally to a Christian meme, I don’t have to worry that I’m having a conversion experience (or that God exists and is sneakily trying to win me over!): it’s perfectly normal, and lawful, for works of fiction to have emotional impact.
The religious allusions seem even blatant now, but there is no way I’m getting rid of my copy of Chronicles of Narnia. I still feel the urge to look in the back of wardrobes.
Thank you. I had a religious song stuck in my head yesterday, but remembered reading you comment so was able to bypass the feeling of guilt.