"Holy, holy, holy" is straight out of Jewish liturgy (it's in the central prayer sequence of the service) and it comes from Isaiah. Why is it currently attributed to a single point of entry into Christianity?
It's cool to be able to read it. But let's not get excited. People were crossing the alps both ways as far as Scotland on a daily basis in the 2nd c; no surprise some were Christian. Enough of a problem to warrant savage reprisals, not a rare and esoteric belief. It doesn't really change much.
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https://www.theguardian.com/commentisfree/2024/dec/25/birth-jesus-plague-roman-empire-christianity