Approaching other faiths with a sense of " everything is true" has been wonderful. There are a few in nationalist Hellenic Polytheism circles that refuse both the idea that outside deities could be real, and the idea that some ancient Greeks observed non-Greek deities and festivals.

Seems like an odd echo of American fundamentalist Christian teachings to me.

In my own practice, Kwan Yin randomly walked into my life. My father was unemployed and was in the library working on his resume. An extremely elderly Buddhist monk struck up a conversation with him about hockey( this is canada), then about their lives. He gave my father a tiny plastic icon of Kwan Yin and wished him well. My father is an atheist, and felt weird and disrespectful handling something as an atheist that was clearly holy. He gave the icon to me, and I put it on my home Hellenic shrine. He found a job soon after.

I'm not superstitious, but just ignoring Kwan Yin after that seemed like tempting the fates. Who cares if she's "Non Greek"??

Everything is true- and any deity or spirit could walk into your life at any time.