It's interesting to explore different belief systems. A trip to Basilique Sainte-Anne is a great way to appreciate one of the local religions.
If you're spending a while in Brazzaville, Basilique Sainte-Anne is a fine place to kick off your exploring. This house of prayer is one of many attractions that'll keep you busy here. Ecole de Peinture de Poto-Poto, Brazzaville Cathedral, and Presidential House are also waiting to be explored close by.