There is no such requests, they offer the conversion or to join, but with no constriction.
Find this "Letter to ISIS" in English, there are many points of Islamic Study to put out from being "muslim" the salafi jihadists.
The URL have detailed description of all that rules (In Russian).

Again - An Nisa, 4:59
This is a Why all those fucking Forced Democratisation in Syria is a Salafi Jihadists job, and muslims are fighting them.

The real thing, that reading Quran is useless thing, there is so much Data, the normal man have no chance to hold that all in the head.

People use the Shariah Law for living rules.