It can be interesting to look into different belief systems. An outing to Chiesa San Francesco is a fantastic way to experience a part of the local way of life.
You'll have sightseeing choices galore when staying in Rieti. Chiesa San Francesco is a good place to kick off here, but there are lots of other interesting places to consider. Palazzo Vescovile, Golf Club Centro d'Italia, and Cammino di Francesco are not far from the house of prayer and and will cap off your day nicely.