Never heard of Gooch so I looked him up. I merely guess, but his ideas might have been revolutionary at the time he wrote them down (i.e. interbreeding of Neanderthals and Sapiens, not so much the rest), but as it seems the story is more complicated than what he proposed.
First, Cro-Magnon is a term historically used specifically for European early modern humans — thus they could hardly be found in Northern India. Second, there is no evidence that Neanderthals and Cro-Magnons worshiped Moon and Sun respectively — there’s a lot of well known evidence when it comes to modern humans and their worldviews (cave paintings, anthropomorphic and zoomorphic figures, etc.), but the proof of Neanderthal art was discovered only recently and it is quite similar to the cave paintings of early modern humans (which again does not imply worship of Sun or Moon). Third, modern humans were present in Europe (Apidima, Southern Greece) at least 210k years ago, well before Neanderthals (then they got replaced by them only to return again).
Next, I don’t know where you got your info, but DNA shows that interbreeding of modern humans and Neanderthals was rather rare — according to a study only “a single pair of individuals between the subpopulations at each 77 generations,” which results in 1–4% of Neanderthal DNA in current genome. There is also a study that shows, contrary to your claim, that there was no contribution of Neanderthal mtDNA in early modern humans, i.e. “successful Neanderthal admixture happened in pairings with Neanderthal males and modern human females.” Thus, even if Neanderthal women paired with modern men, their offspring is now extinct (and thus we have no clue if it actually happened).
So, I must confess that I look at Gooch’s other ideas (e.g. theory of polarities) with a mild SMH (I won’t go into details, but theory of polarities is particularly facepalm inducing, especially considering that Gooch was a psychologist).
As for Nephilim, as I have written elsewhere, “the Hebrew word itself literally means ‘fallen ones’, is usually translated as ‘giants’, but can also mean ‘warriors’, ‘the violent ones’, ‘the ones falling [upon their enemies]’, ‘sons of the rulers’, or ‘sons of the judges’. Well, if you ask me, that’s a pretty good description of ‘heroes of old, men of renown’ (as per Genesis 6:1–4). If we go by known occurrences of large floods in Levant, it puts Nephilim right before 3000 BCE.”
Long story short — not so long ago, I tried to link Nephilim with arrival of Proto-Indo-Europeans (PIE) into Levant and rise of hierarchical societies as the whole thing with “sons of God” and implied conquest very much reminds me of non-duality gone wrong. Alas, as I elaborated here, non-duality almost certainly originated with Indo-Aryans c. 2000 BCE when hierarchical societies in Levant were already in full swing, so there would be a discrepancy of (at least) one to two millennia (and also other inconsistencies). Thus, 1) this Biblical myth is either of later origin and must be a mixture of several myths spanning a rather long period; 2) there was indeed an earlier arrival of PIE, we just lack evidence; or 3) something different was going on and the myth refers to another group of “conquistadors” (however, why they are referred to as “sons of God” is in this case completely beyond me). Well, for now this is an open-ended question for me ;)
