It's often interesting to look into differing beliefs and values. An outing to Masthugget Church is a great way to learn about one of the local religions.
You'll have sightseeing choices galore when staying in Centrum. Masthugget Church is a good place to begin here, but there are numerous other fine places to experience. Liseberg Amusement Park, Universeum, and Gothenburg Opera are close to the house of prayer and will round out your day nicely.