the Islamic religion is not a peaceful one, so if the muslim nation is peaceful it probably isn't interpreting it's religion properly.
Islamic religion itself is no more violent than Christian religion. Bible has passages that ok slavery, subordination of women, or violent punishments. Lots of wars and crusades were waged in the name of the bible. It is all in people's heads and hearts. The fact that most Christian societies gave up on warring with each other and adopted democratic practices stems from their social, economic and cultural transformations. Quran is peaceful when interpreted by peace-desiring people. And there are many islamic pacifists. Also many moslims writing about and striving for democracy and human rights.
I didn't say anything about the bible being peaceful. I don't consider it to be as violent as the Quaran. I certainly don't consider certain sects of buddhism to be violent. These are things that can be compared. Jesus wanted his followers to "turn the other cheek." Muhammed wants to use force to convert others to what he considers the true religion. ?
The Quaran repeatedly and expressly tells its followers to murder and go to war for various reasons. This is why it is not peaceful. Have you ever read the Quaran?