You needn't have a strong religious faith to appreciate the serene atmosphere of Beauvais Cathedral. Ask when the next service starts or when you can go for a wander through.
You'll soon see why this Beauvais principal church is visited by many travelers. If you're looking for other things to keep you busy, Parc St Paul, National Tapestry Gallery, and Elispace are in this area too. They won't take very long to get to from Beauvais Cathedral.