The best you could do for Islam is look for (former/) Muslim scholars (secular and religious) and see what is available translated to your mother tongue or some tongue you speak. Of course, reading the al-Quran and the hadiths is relevant, even if translated. The more knowledge of Arabic you have, the better you will be able to understand Islam.
https://quran.com/
https://sunnah.com/
There is also this encyclopaedia I quite like, called
Encyclopaedia Iranica. I haven't read much about Islam from it, so I don't know how its approach is. Atheist Iranians can have quite the negative bias towards Islam, while Muslim Iranians will obviously have a positive bias, but it is up to the reader to trust the scholars to remain as neutral as possible.
For example:
https://iranicaonline.org/articles/eschatology-iii
Distinction between Sunni (majority), Shia (Persians especially), Sufi (Oman).
A Persian scholar might have a more shia perspective, while Saudi scholars may have otherwise. You will have to read from different sources and synthetise.
Perhaps it is interesting for you to look for the connection between Islam, pre-Islamic paganism,
Nestorian Christianity, and Judaism. The whole praying to a certain direction and prostrating while praying existed in Christianity, and still exists in Eastern Orthodox Christianity.
Since we are a philosophy forum, it is useful to look into Neoplatonism and Aristotle in Islam, especially the Golden Age. The proclivity of empires in Central Asia to convert to Islam is also noteworthy.
Coptic grammatical influence on Egyptian Arabic:
https://www.jstor.org/stable/597639
TL;DR: not much.
In
Belarus, in
China.
For more modern affairs, secularisation of Turkey and Egypt and Central Asian and Caucasian countries, apostasy in theocratic Iran, coexistence of Christians and Muslims in Lebanon, Israel/Palestine, Hezbollah and Hamas in the Near East, Boko Haram in Africa, the link between Taliban–Al-Qaeda–ISIS.
Whoever else hereabouts might simply recommend you some doctor of Islamic studies from Oxford called John McSmith who has never been to the Middle East and only understands written Classical Arabic.
Don't trust armchair scholars when it comes to things that are all about lived experience — language, culture, religion.