//Or perhaps this word for Egypt is a retrojection; it wouldn’t be the first in the OT.//
Yes, retrojection is possible. However, a plainly speaking Mathura still stands on a higher pedestal than a retrojected Misr.
//The first Yam Suf could be the Indus River. Why not a shallow string of lakes or the East Nile Delta?//
There would be no need to cross the marshy lakes when one could circuit around them on dry land. Also the Pharaoh need not follow them knowing they will come out on the other side. Also there is no natural event corresponding to separation of waters. On the other hand eruption of a mud volcano—known in the area—could have led to the separation of waters as described in the Bible.
//the Sinai Volcano could be Taftan. Gods are often said to reside on mountains; the smoke and weather could be theological.//
Possible. But in the first instance we must look at what is staring in our eyes.
//parallels between Adam and Swayambhu Manu. True in that they were both the first man, but there is no cycle of Adams and no concept of any Fall for the first Manu.//
While looking at parallels, I feel that methodologically we must give more importance to geographical, archaeological, etymological information, narratives and living traditions than theological constructs. Theology must come last because it is most influenced by contemporary developments. Further, the numbers of Prophets are parallel to numbers of Avataras. The fall of Adam is a true difference that has to be considered.
//Noah and Vivaswat Manu. True, but the inspiration behind this story most likely came from Mesopotamia.//
The Jewish tradition holds that the flood took place in early October. The floods in India take place in July-Oct while in Iraq in spring. Secondly, the flood waters do not stay for 150 days in Iraq which has an open channel to the sea to drain the waters. The city of Jalore (“Water City”) in India is located in a bowl-like geological formation and even normal rain waters stay for 2 months.
//Abraham and Rama. But Abraham was just a man, not a beautiful incarnation of a deity who smote a demon king.// Again the parallels in etymological information, narratives and living traditions, I suggest, dominate the differences in theological constructs. Further, as said above, the numbers of Prophets are parallel to numbers of Avataras.
Thanks for this dialogue.