[1] Among his prominent claims were that Christianity and Islam are both derivatives of Hinduism; that Vatican City, Kaaba, Westminster Abbey and the Taj Mahal were once Hindu temples dedicated to Shiva; and that the Papacy was originally a Vedic Priesthood.

Mumbai), before being inducted as a Class I Gazetted officer in the Ministry of Information and Broadcasting wherein he wrote various journalistic pieces.

He adds that the technical know-how to construct structural buildings didn't exist in 4th-century India, Oak's original claim, the only surviving architecture being rock-cut or monolithic.

According to Oak, the text of the alleged inscription is taken from the page 315 of an anthology of poetry entitled Sayar-ul-Okul (Se'-arul Oqul meaning the memorable words),[14] compiled in 1742 on the orders of a "Sultan Salim" (the actual Sultan at the time being Mahmud I, sultan Selim III lived from 1761 to 1808) from the earlier work of prophet Muhammed's uncle Amr ibn Hishām (poetic name "Abu al-Ḥakam" (or ابوالحكم) or meaning the "Father of wisdom") who had refused to convert to Islam, and, first modern version published in 1864 in Berlin and a subsequent edition was published in Beirut in 1932.

[16] Srinivas Aravamudan notes Oak to be a 'mythistorian' whose work resorted to exploiting comparative philology in the generation of delusional etymologies—associating Sanskrit sound-alikes with foreign terms such as Vatican to vatika (hermitage), Christianity to Krishna-niti (the way of Krishna), Abraham as an aberration of Brahma -- to purvey an Islamophobic and anti-Christian agenda under the covers of Hindutva.

[21] Art historian Rebecca Brown described Oak's books as "revisionist history as subtle as Captain Russell's smirk" (referring to a character in the Hindi movie Lagaan).

[22] Oak's theories have been noted to have found a popular following among right-wing Hindu factions in a bid to wage politico-religious battles.