It is probable that the religion of the common progenitors of the
Hindus, Persians, Greeks, Romans, Kelts, Teutons, and Slavs, in their
hard and sterile home in Central Asia, was a worship of the powers of
Nature verging toward pantheism, although the earliest of the Vedas
representing the ancient faith seem to recognize a supreme power and
intelligence--God--as the common father of the race, to whom prayers and
sacrifices were devoutly offered. Freeman Clarke quotes from Müller's
"Ancient Sanskrit Literature" one of the hymns in which the unity of God
is most distinctly recognized:--

"In the beginning there arose the Source of golden light. He was the
only Lord of all that is. He established the earth and sky. Who is the
God to whom we shall offer our sacrifices? It is he who giveth life, who
giveth strength, who governeth all men; through whom heaven was
established, and the earth created."

But if the Supreme God whom we adore was recognized by this ancient
people, he was soon lost sight of in the multiplied manifestations of
his power, so that Rawlinson thinks[2] that when the Aryan race
separated in their various migrations, which resulted in what we call
the Indo-European group of races, there was no conception of a single
supreme power, from whom man and nature have alike their origin, but
Nature-worship, ending in an extensive polytheism,--as among the
Assyrians and Egyptians.

[Footnote 2: Religions of the Ancient World, p. 105.]

As to these Aryan migrations, we do not know when a large body crossed
the Himalaya Mountains, and settled on the banks of the Indus, but