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.
Dual seems rather limited. I mean unitarians and bahai combine more than two.
Bahais have the syncretism built in though. If you were to ask one “what else are you”, they’d say “I’m just a Baha’i, I can’t be anything else.”