You don't need to have a strong religious faith to appreciate the serene atmosphere of Munsterplatz. Ask when the next service starts or when you can go for a wander through.
This Basel City Centre principal church is an interesting place to begin your day of sightseeing. There's loads to experience nearby, such as Basel Zoo, Basler Muenster, and Beyeler Foundation. Wander around at your leisure at Munsterplatz before hitting up these other fine sights.