I am confused, are you saying you created this video? When I read it, it implies to me that you did. But I am not sure, if you did it is very professionally made. So that is why I ask, because if you did not make the video it might be that not all portions actually represent your view.
To me, in the video, two subjects are the focus of "why I left":
(1) an attraction/discovery of science and things such as evolution, and the assumption all Muslims reject science...
(2) an abhorrence to the violence found on videos of Islamic extremists burning, beheading, etc..
The word cult is also used.
I use the word cult a lot when dealing with some who are obviously involved in real cults, such as the father of Ted Cruz for example. I also see many in politics that are involved in what is really a cult, I saw this with circles of Democrats in San Francisco on the far left, and in fact some of these mixed both their political cult with religion and were going around shaking hands with "Reverend" Jim Jones of the People's Temple in San Francisco, his cult ended up with the mass suicide and murders in Guyana.
It is good to break away when there are obvious "issues" that tear one apart at a personal level.
Here are just a couple of extra thoughts, however. One, in regards to science, I have observed what I would call in my opinion cults within "science". For example, half-baked "scientists" under the influence (and often intimidation of) politicians and threats from power hungry government, the "global warming" cult which often is a religion of it self. And then we see, while not going to the extent of beheadings, literally brainwashed cultists of this sect threatening anyone who has a different scientific conclusion and who disagree, threats to destroy their livelihood and their families, threats to free speech and so on.
This is just one example, there are others and the point being is even in science you have some of the same issues you see in Islam. Including violence. After all, most of the horrific weapons were made by scientists. A video of the dead and burned and maimed should perhaps be shown and then blamed on scientists.
I perfectly understand your concerns, I am with you un that. But also have a broader perspective. Do not be a cultist of simply another cult even if not religious. It is funny. I am a fan of Alberuni's writings (Al-Bīrūnī, Abū Rayḥān Muḥammad ibn Aḥmad Al-Birunī), he was a Muslim who wrote a fantastic book and travelog on India, he lived from 973 AD to 1048 AD, he also authored books on mathematics, science and so on. He was a Khwarezmian Iranian Muslim scholar. It is clear, that in those times, Islam was very highly advanced in science, astronomy, discovery and exploration.
What happened?
If you start to really look at it, it was government that began to grab power, more and more, and then at some point things started to devolve.
Today terrorists use modern weapons to destroy others, weapons which they did not invent, to put others back into the 12 Century when these weapons did not exist.
Anyway, hope you keep safe from the fanatics. And become involved in reforming. But don't assume things also.