“If, leaving for the present the prominent founders of Christian sects, we now turn to that of the Ophites, which assumed a definite form about the time of Marcion and the Basilideans, we may find in it the reason for the heresies of all others. Like all other Gnostics, they rejected the Mosaic Bible entirely. Nevertheless, their philosophy, apart from some deductions original with several of the most important founders of the various branches of Gnosticism was not new.
Passing through the Chaldean kabalistic tradition, it gathered its materials in the Hermetic books, and pursuing its flight still farther back for its metaphysical speculations, we find it floundering among the tenets of Manu, and the earliest Hindu ante-sacerdotal genesis. Many of our eminent antiquarians trace the Gnostic philosophies right back to Buddhism, which does not impair in the least either theirs or our arguments.
We repeat again, Buddhism is but the primitive source of Brahmanism. It is not against the primitive Vedas that Gautama protests. It is against the sacerdotal and official state religion of his country: and the Brahmans, who in order to make room for and give authority to the castes, at a later period crammed the ancient manuscripts with interpolated slokas, intended to prove that the castes were predetermined by the Creator by the very fact that each class of men was issued from a more or less noble limb of Brahma.
Gautama-Buddha’s philosophy was that taught from the beginning of time in the impenetrable secrecy of the inner sanctuaries of the pagodas. We need not be surprised, therefore, to find again, in all the fundamental dogmas of the Gnostics, the metaphysical tenets of both Brahmanism and Buddhism. They held that the Old Testament was the revelation of an inferior being, a subordinate divinity, and did not contain a single sentence of their Sophia, the Divine Wisdom. As to the New Testament, it had lost its purity when the compilers became guilty of interpolations. The revelation of divine truth was sacrificed by them to promote selfish ends and maintain quarrels. The accusation does not seem so very improbable to one who is well aware of the constant strife between the champions of circumcision and the “Law”, and the apostles who had given up Judaism.”
H. P. Blavatsky
The Mark Of God: Understanding Your "I AM Presence" 