I agree that there are many good Muslims, but how can you separate the good from the bad? How can you tell which one is a casual follower of Islam and which one follows it to every detail of the teaching/law?
There are numerous Muslims who are absolutely terrified at these events as much as the next person. Just a day earlier, Arabs/Muslims/Christians in Lebanon were killed by the same group. Many statements have been made by Muslims in the US and around the world denouncing the actions of ISIS and their extremism. ISIS is like the drug cartels in Mexico, except they are fueled with religious propaganda.
The verses in the Qur'an regarding killing the unbelievers relate to historical battles where they were defending themselves from enemies attacking them, and are misinterpreted by the extremists to apply to any situation they wish.
If anything, the Bible contains a lot more literally violent, non-understandable injunctions like killing your kids when they are disrespectful, not allowing women to speak in front of men, and so on. (Not trying to Bash any religion here, just comparing).
With all due respect -- you mentioned to others they need to read more, but it sounds like you need to read more, a lot more.
Muslims ruled most of the known world for a while -- Have you ever heard of the Ottoman empire? The 'Moore' /Islamic Empire in Spain that spanned 1,000+ years?
The reason I ask is, why wouldn't they just kill all those who didn't believe in their religion at that time, since it's such a large injunction and foundation of their religion, according to you? Obviously everyone they ruled over didn't share their faith, and their descendants are obviously around today. Just do some simple research and you'll discover the things I'm saying.
You won't find anything unbiased watching Fox news 24/7.