You needn't be religious to appreciate the serene atmosphere of Rodez Cathedral. Ask when the next service is scheduled or when you can go for a wander through.
You can keep your wallet safely in your daypack, because it won't cost a thing to visit Rodez Cathedral. Located in Rodez, you'll find some interesting attractions not far from this principal church. Why not visit Soulages Museum, Place dArmes and Fenaille Museum too?