Just want to add a note that "Tantra" preceeds Hinduism, in contrast to its note within this text. Tantra is more than 7,000 years old, on Earth, whereas Hinduism is hardly more than 200 years old. Hinduism has icons that are thousands of years old -- just as Christianity holds to Moses and Abraham -- though the religion of Hinduism, in its current form, did not exist until very recent history. Hindus who claim otherwise are like Jews and Christians who claim that the Earth was made 6,000 years ago and that Adam and Eve were the first people. Even a rabbi will tell you that there were millions of people alive when Adam and Eve were here.
In contrast to religion, Tantra is methodological, scientific, whereas religion succumbs to local, provincial and other cultural and societal prejudices, more often also attempting to trump all other cultures, sciences and experiences of any and all people, by the religion's leaders who deem them as "other", goya, goyum, the south end of north-bound jackasses. Tantra is the intuitional science that begins with the origins of the universe, traces toward its manifestation, then forensically traces the journey from there to the present and from the present toward liberation -- neither a religious or other cult nor an ism of any sort, other than universalism.
As far as Abraham is concerned, I and others have asked many Christian preachers and priests, rabbis and other theologians about what sourcing Abraham may have had for establishing Judaism, what was the societal foundation that surrounded Abraham at that time. In almost every circumstance, we all got the same relative answer, as if asking a mathematician about dividing by zero -- pre-Abraham was rather undefined by nearly every one of them. In my search for the answers I found one person who had accumulated vast amounts of information about Abraham, and he came up with this magnificent treatise.
You'll find, among many things, that Abraham, a name that quite obviously resembles "Brahmin" and "Brahman", was a worshipper of Shiva, known as Shaivite in modern usage, that Isha, Isaiha, Ishmail, and Escenne all refer to worshipping Shiva or performing his practices, otherwise inclusive of Tantra.