I have a soft spot for the topic of people who are dual faith. It’s weird, you know. If you’re an atheist, you get a thumbs up from me. If you’re religious with one faith, you get a raised eyebrow from me. And if you are dual faith, you get two thumbs up from me. It just feels like you’re more open-minded if you are more than one faith.
I like this topic. Pretty much wherever you go, people are practicing this kind of syncretic belief. This is why the “same” religion in two different countries has local flavor. More often than not, when a religion is expanding into new territory, it absorbs some of the preexisting local beliefs. Christmas is a good example within Christianity, with the Christmas tree.
Another example is Japan where they say “you’re born with Shinto, marry with Christianity and die with Buddhism”. Many places maintain animist beliefs alongside more recent religions. There are even communities in South Asia where people attend both Muslim mosques and Hindu temples!