It's always the patriarchal conquerors like the Ancient Romans or the Ancient Greeks that they idolize and never the people like, say, the Picts or the Celts or the Gaul that rebelled against the brutal Roman empire. It's never the Scottish or the Irish heroes who fought back against the British Empire that followed in Rome's footsteps. None of them probably even know who Boudica is.
Ironically, a lot of the stuff you could call "white culture" was burnt at the stake, banned, brutalized, and literally demonized by the Empires that chuds think are so civilized. A lot of pagan culture was lost to time, or warped by Roman 'scholars' for propaganda purposes. If they truly cared about their 'culture', then "Muh Christian trad wife' would be seen as killing the identity of pagan women, rather than an aspiration.
IDK for a quick overview online. Gist of it, there's evidence of shared religious ideas around the Mediterranean due to contact between Myceneans, Hittites, Assyrians, Egyptians, Babylonians, and Ugarits. They had a shared religious language, a sort of koine, and a common repeating symbol was the solar goddess, generally depicted as the Potnia theron(πότνια θερον), the lady of animals. After climate catastrophe ended the bronze age, her worship fell and indo-european worship thundered down the steppe. This focused on the oak god of storms predominantly, Zeus to the Greek, Jupiter to the Italics, Tarans to the celts, and Thor to the Germans. Some aspects of the solar goddess get reworked into the bride of the thunder god, but in different ways between the cultures. In earlier Greek texts, Zeus' wife is Dione, and she is sometimes preserved poetically as the mother of Aphrodite. This is linguistically fitting, as Zeus and Dione both derive from the Proto indo European root for light, *Di-. The Greek ζ has a d sound our z does not. Anyway, Hera flanked by peacocks takes over this role, and is so firmly established by the 8th century that Dione isn't even on the list of Zeus' wives in Hesiod's Theogony
Oh also Graves would just read stuff and see what his poet's soul thought was true, so like the opposite of research.