The figure in 2015, was 1.8, I haven't seen where that's been re-estimated, but even if it is slightly overblown that's the 2nd largest religious group in the world.
As for your points, that is fine, but you're not taking issue with Islam itself at that rate, rather you are taking issue with certain Imams, Countries, or groups. There are millions, upon millions of Muslims living in, North America, India and Europe living peacefully.
Look at groups like The Lord's Resistance Army in Uganda just to name one of several. If all of Christianity were to be blamed for their actions, it could be called a religion with problems too.
The Bible also prescribes the death penalty for things like Audultry, Prostitution of a Priest's daughter, A child who continually disobeys his parents, not honoring the Sabbath and the list goes on. We've just decided as a society that certain aspects like that are no longer acceptable. They need to decide the same, and while most of them have there's still strongholds of them stuck in the past, where this was what you did.
https://en.wikipedia.org/wiki/Crime_...e#cite_note-26
So yes I agree, some interpretations of the Koran and converting it into a State run doctrine, is not advantageous for Christians, or even the Muslims enduring it, but it has less to do with the religion as a whole and more to due with their cultural beliefs.
ISIS isn't unspeakable... Unless you meant.......