It's interesting to delve into differing beliefs. An outing to Church of St. Nicholas is a wonderful way to learn about a part of the local culture.
You'll have sightseeing choices galore when visiting Wil. Church of St. Nicholas is a good place to start here, but there are many other worthwhile spots to appreciate. Parish of St. Gallus, Murg, and Wil Tower are close to the house of prayer and will top off your day nicely.