Honestly, Islam needs reformation, or less violent scholars. The only religion that remained untouched is Islam. As much as people think that it still applies on the 21st century, I am inclined to disagree on that. There needs to be a reformation. Some Islamic countries don't even follow Sharia law, yet they pray 5 times a day, and they're turning out to be perfectly fine. Some countries partially implement it, and some fully implement it, like Saudi Arabia does. However, the KSA royals actually use the religion to their advantage to keep their people in check, and to maintain an image, which is fake.
I know this whole ISIS thing does not really represent Muslims, but a good number of them joined ISIS, and that goes back to their religious teachings, their culture, their families and people they looked up to. Also, the recent converts take every word in Islam literally, and that's also how we have many foreign fighters with ISIS too.