What is Reddit's opinion of Cosmology of the Qur'an: The Seven Skies and the Fixed Ground?
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Leave history to the historians. You don't have the skills or the training to dwell in it.

If you really want to actually study history, then join a University and take up a Near Eastern History degree and a doctorate, do some actual research, publish peer reviewed papers that actual academics can critique.

It is very easy to be an armchair historian and dish out theories on reddit with zero academic peer review.

Quranists have been dolling out conspiracy theories by the dozens, each one more embarrassing than the other. The sooner we put a stop to this, the better.

Spirituality and history are two different realms. The former only needs a sincere heart and direct connection with God, and reading the scripture with sincerity, humility and common sense (without trying to "abrogate" any verses, or cooking up any conspiracy theories). It does not need one to be a historian. Any layman can do this, and God guides whoever is sincere to the straight path.

History is a specialized field, just like any academic field, which needs dedicated study and formal training.

Just today a video of a certain ignoramus called Said Mirza was shared with me as an "expert" of the Quran. Turns out he has no training in geoscience, astronomy or cosmology, but has the audacity to self-publish a book called "Cosmology of the Qur'an: The Seven Skies and the Fixed Ground", and attribute flat earther nonsense to God.

The sooner we put an end to this approach, the better.

Some Quranists have the misconception that the word "Hadith" in this verse refers exclusively to the Hadith corpus that evolved in the centuries after Muhammad's death.

(45:6) These are God's signs that We recite to you truthfully. Then in which Hadeeth besides God and His signs would they believe?

But it refers to any Hadith that is used as a source of religion besides the Signs of God.

For example, this guy is an ignorant who puts out hours and hours of extra-Quranic videos and books. He was a computer engineer by education, an IT field dropout with no training or knowledge in the fields he is making videos and writing books about- namely lingustics, history and astronomy, and an absurd, irrational conspiracy theorist of the QAnon genre that social media has given a platform for. All the extra-Quranic lies that he concocts and attributes to God are also "Hadith besides God and His verses". Hadith is not restricted to Bukhari. Following the Quran alone, means we just read the Quran, and the meaning would already be clear and well known, without reading volumes of Bukhari or Ibn Kathir or Said Mirza or XYZ.

The same guy "published" this book: Cosmology of the Qur'an: The Seven Skies and the Fixed Ground, where totally ignorant of basic geography and astronomy, he promotes flat earthism, inspired by his mentor and teacher Sam Gerrans.

Coming to your question, Hadith fabrication did not stop in the 11th century CE. It is continuing to this day in real time.