:::True islam:::

Oktar has had written for him, by ghostwriters, numerous books under the name Harun Yahya (Harun (Aaron) and Yahya (John)), arguing against evolution. He also asserts that evolution is directly related to the claimed evils of materialism, Nazism, communism, and Buddhism[38]. Most of his anti-evolution resources are identical to Christian creationist arguments.[39]

He also has produced various works on Zionism and Freemasonry, accusing Zionists of racism and arguing that Zionism and Freemasonry have had significant negative effects on world history and politics.

Oktar's books on faith-related topics attempt to communicate the existence and oneness of God according to the Islamic faith, and are written with the main purpose of introducing Islam to those who are strangers to religion. Each of his books on science-related topics stresses his views on the might, sublimity, and majesty of God. These books attempt to display for non-Muslims what Oktar claims to be signs of the existence of God, and the excellence of his creation. A sub-group within this series are the series of "Books Demolishing the Lie of Evolution", a critique of the ideas of Materialism, Evolution, Darwinism, and atheism.

Many of Oktar's books have been made into high-resolution videos which are freely downloadable on the Internet[40].

Oktar asserts that Buddhism as being a false religion built upon idolatry and falsehood.[38] He calls Buddhist rituals "meaningless" and "empty". He has also charged that intelligent design is a tool of Satan.[41]