premjan

Sanskrit tends to lend itself to this sort of etymological wordplay (probably because it uses very abbreviated word roots - is that a bit like Chinese anyone?) and there is literally tons of pseudo-accurate stuff like this, most of which is nationalistically motivated literature by Hindus.

Saraswati means "watery" referring to the watery river (one of large drainage), and I have never heard of it being referred to as "Sarai" though "Sarai" nowadays in Hindi means "road". Abraham AFAIK was a resident of Mesopotamia so it is the wrong set of rivers, as the now-dry Saraswati (ghaggar-hakra) is located near the Indus though some have claimed a similar river in Iran and there is one sometimes referred to as Saraswati in Afghanistan.

There were some Indo-Aryans living in the Holy Land and Mesopotamia area at one point called the Mitanni so it is barely possible that some cultural elements were borrowed, or even that Abraham came from this group - but they were mainly a ruling class I think.

Brahma is the generic name for the creator God. What does "Abraham" mean?

Muhammad means praiseworthy, and Mahadeva doesn't - Maha means great or large, and Deva means God, and it is a synonym for Shiva. Islam is very much in the Semitic tradition which has basic philosophical differences from the Indo-European tradition, so one can't just smudge the two together. It is perfectly possible that there was a version of Shiva being worshipped in polytheistic Mecca (I have not seen a full list of the 72 idols that were worshipped there). The little black stone could be a symbol of Shiva, though the latter tend to be little upright cylinders with rounded tops and a sort of bowl base - it is a stylized representation of male and female genitalia in coitus.

The dress worn for pilgrimage in Mecca is indeed evocative of the garments Hindus wear at religious ceremonies, so there could be some cultural link there.

I have seen some speculation that the (some?) Jews are descendants of an itinerant technically-oriented (nonphilosopher) Hindu upper caste worshipping the creator God called Vipras. But the Jews for sure appear to have no such memory. There certainly were some Jewish people living in India after the disbanding of Israel in Jesus's era and St. (doubting) Thomas is said by some to have visited India.

So basically, Gene Matlock is closer to Salman Rushdie in the spirit of his work (magical historicism maybe) than conventional history, which itself tends to be fraught with difficulties in its study.