Well there are two types of Muslims. Sunni and Shiait.
Sunni's are mainly in Soudi Arabia, and North Africa etc and a big chunck in Bangadesh (Where my Dad comes from). Shiait are mainly in Afganistan, Iran, iraq etc. Shiaits follow not only ALLAH and Muhammad but also Muhammads two Grandsons. Sunni's dont take the G/sons to be of great importance and thats why the two grp clash.
I found Shiait's a bit NUT's (Dont get me know not all...but there are quite a few).
We also found them a bit more Violent. I tell you, I was taught Quaran at school and I read it too...and no where does is talk about kiling innocent ppl, attack innocent ppl or any ppl. It gives a muslim the right to defend it self but never attack another.
So all this Jihad bull sh*t is just man made. It just makes me sooooooo mad!!