It's interesting to explore differing beliefs. A visit to Church of St Mary is an excellent way to learn about one of the local religions.
When you've finished exploring this house of prayer in Birkirkara, why not check out Blue Grotto, Fort St. Elmo, and Catacombs of St. Paul and St. Agatha's Crypt? They're not very far from Church of St Mary and also a favorite with travelers.