Under the pseudonym HARUN YAHYA, the author has published numerous books and booklets explicitly proving the existence of Allah, emphasising the marvellous creation of Allah against the materialistic and atheistic ideologies, and of course their most efficient and significant view: the Evolution Theory. Harun Yahya’s book, “Evolution Deceit” is an important step taken in order to totally refute this false theory. "The End of Materialism", "The Collapse of Evolution: The Truth of Creation", "Microbiological Collapse of Evolution", "Collapse of Materialism", 'Darwinism: The Greatest 'Scientific' Fallacy",  "The Fallacies of the Evolutionists", "Secrets of Atom", "Destruction of the Societies",

The author has also released various studies regarding belief in Allah. The books of the author that have been published till now are; “Ever Thought About the Truth”, “Devoted to Allah”, “Abandoning the society of ignorance-Jahilliya”, “Paradise”, “Theory of Evolution”, “Moral Values of the Qur’an”, “Quranic Index”, “The Hegira in the Qur’an”, “Hypocrites in the Qur’an”, “Communicating the Quranic Message”, “Basic Concepts in the Qur’an”, “Answers from the Qur’an”, “Death, Resurrection, Hell”, “The Struggle of the Messengers”, “The Apparent Enemy of Man: Satan”, “Paganism”, “The Arrogance of Satan”, “Prayer in the Qur’an”.

Besides, the author has the books “Miracle in Cell”, “Miracle in Eye”, “Miracle in Spider”, “Miracle in Mosquito” which scientifically deal with miraculous creation of Allah. The author has also published books on political issues on Bosnia, and Kosova, and also some of his articles are published in the prominent newspapers. 

The common purpose in all these studies, is to convey the message of the Qur'an, and thus to courage them to think on basic faith related issues such as the existence and unity of Allah, and the Hereafter. The author does not have a commercial purpose of his studies. Free copies of his various books and booklets are distributed.