So long as Islam continues to exist, people like IS, and the Taliban, and Al Qaida, will also exist.
Not all Muslims are extremist. however, Islam is riddled with extremism. As a religion, it has failed to sort itself out.
Nobody else can sort it out, because we are told to mind our own business.
Continuing to recognise Islam is like keeping an old car, just because some parts of it are good. The engine doesn't work, the tyres are flat, the body is rusty, and the windows are all broken ... but you keep the car because the seats are still quite comfy.
That's Islam. It's like a rusty, clapped out old car. It's impossible to update it. So ... it has to go.
We should no longer recognise Islam in any form.
The good Muslims will soon find another faith to follow. Buddhism, or something. Nobody will suffer.
But when these people say "Allah commands us to kill the infidel ..."
Our answer must be ... "No he doesn't ... because he doesn't exist!"