Trinity Church is not just a house of prayer, but a recommended tourist attraction as well. Make a pilgrimage and enjoy some moments of quiet contemplation.
You'll have sightseeing choices galore in Lutsk. Trinity Church is a great place to start here, but there are plenty of other interesting spots to explore. House of architect Golovan, and Volyn Museum of Local Lore are close to the house of prayer and and will cap off your day nicely.