The_(not)_Omniscient (It’s a good job you have made a typo by leaving out the ‘n’ in your name).
I would have trouble calling you by one of the Names of Allah (SWT) and we should be hyp enough to realise that it is not adab to choose for ourselves such titles.
It is good that you have spent 7 years researching the Qur’an, but I fail to realise how by researching the Qur’an you can become an expert on matters regarding groups and affiliations.
And if it is the Qur’an you excel at, then there are a few questions I can ask may be for another time so I can seek to benefit from your knowledge.
The question that stands out beyond the others is the idea that the presence of a Divine Book is a standard by which we should not follow shuyukh. This baffles me as the Qur’an was taught to us by Muhammad (SAW) through an unbroken chain of teachers to our present day scholars. The Words truly belong to Allah (SWT) but the medium is the human tongues, ears, and hearts.
Our Book is not like the tablet given to Musa (AS) which was a complete written form fully disclosed. Ours is an oral and aural Book delivered through people.
To your thread question the answer is ‘yes’ sufism is not Islam … However to assert that Islam is any way void of spirituality and ascetic even gnostic activity then you are mistaken. Many hadith references demonstrate this and what may surprise you is that the Qur’an supports the essential basis for tassuwwuf which is dzikr.
Now the question can be put to you so you can demonstrate what reality you are presenting here on this thread. And that is if your studies on the Qur’an have revealed to you that sufism is a deviation what say is your conclusion of the 'aqeedah and the fiqh. What does the Qur’an say about these?