To what extent is the book "The Story of Creation from the Throne to the Earth" by Eid Wardany, which rejects scientific theories and uses Quranic verses, authentic?

The questioner is right not to be convinced by the aforementioned book. Its author lacks academic standing and does not reject established scientific facts on the pretext that they contradict the Qur'an, whereas they contradict his own understanding. There is no contradiction between the reality of gravity and His (Allah's) saying: "Indeed, Allah holds the heavens and the earth, lest they cease" (Qur'an 35:41), for Allah is the One Who decreed attraction. Likewise, Allah's subjugation of the sea does not contradict the law of buoyancy. These established laws are from Allah's wisdom; they open horizons for contemplation and increase certainty. Allah created these laws as a mercy to creation, so that they may interact with the universe and innovate what is necessary for their sustenance. The aforementioned book was not successful, and specialists did not agree with it. The claim that modern sciences are erroneous and contradict the Qur'an is strange and regrettable, whereas these sciences are built upon clear foundations, and in some aspects, they prove the scientific miraculousness of the Qur'an, which has led many to embrace Islam.