Which is the stronger case for the origin of the Celts? The Danube region or Iberian peninsula?

It’s no surprise that Hindu’s ancient religious texts preserve the PIE religion best, so comparing that with Celtic Druidism was natural given the thread topic.

Yet I wonder if Druidism has preserved some PIE religion features better than some other I-E religions. (This mightn’t be surprising: the Greeks borrowed Aphrodite from the Phoenicians; some of the Roman gods were Etruscan, and so on.) Mallory’s old book lists several, almost uncanny similarities between ancient Hinduism and, specifically, Irish Druidism, one of which I mentioned here two years ago:

If you click the link to post-in-thread you will see that I immediately got two responses deprecating the thesis (“sacrificing animals … is common to a lot of religions”). I followed up with more evidence:

… but, unsurprisingly, the equation Epomeduos = Ashvamedha was apparently devoid of merit since no support or retraction followed in that thread.

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Of more direct interest to the thread topic would be similarities between ancient Celtic and Italic religions. AFAICT this does not quickly lead to obvious evidence for Italo-Celtic recency. Deity names cognate between Roman and Welsh or Irish include mostly names common to several I-E branches. A possible exception which one source considers to be a cognate pair (but many/most would reject) is “Roman Mars; Irish Morrighan.”

Interestingly, Morrighan is a Goddess of War, contrasting with the male Mars. Celtic Andrasta/Andarta was also a Celtic Goddess of War (or Strength) the above source considers cognate to Hindu’s male Indra.