I've always liked this same sort of line of thought. I tend to think of religions a bit like languages and language families. Eventually, if you trace it far enough back, we all come from a single source, even if we're not able to reconstruct that source in its entirety. Proto-Indo-European gave rise to English, German, Latin, Sanskrit, et cetera, et cetera. Likewise, PIE mythology can be seen echoed in many of the world's religions, including Christianity, introduced from India to Iran. There has been a lot of interfaith syncretism throughout history, from Mesopotamia to the Vatican, and the Indus valley to Japan. We're speaking different languages, but there are so many cognates that let us know that we're still one family.
I've always liked this same sort of line of thought. I tend to think of religions a bit like languages and language families. Eventually, if you trace it far enough back, we all come from a single source, even if we're not able to reconstruct that source in its entirety. Proto-Indo-European gave rise to English, German, Latin, Sanskrit, et cetera, et cetera. Likewise, PIE mythology can be seen echoed in many of the world's religions, including Christianity, introduced from India to Iran. There has been a lot of interfaith syncretism throughout history, from Mesopotamia to the Vatican, and the Indus valley to Japan. We're speaking different languages, but there are so many cognates that let us know that we're still one family.