Did Religions Cause All/Most Wars in History?

Do religions really cause violence? Is religion the cause of most wars?

Throughout history religion has been tied to massive tragedy and loss of life but is religion truly at fault for events like the Crusades, the Holocaust, and extremism in the Middle East? It is a very common claim that "Religions caused most of the wars in history".

Many atheists and agnostics will often cite the Crusades, 9/11, and other such conflicts to back up their claims. "Look at Israel/Palestine, Northern Ireland, ISIS, 911!" they say.

But are there alternative views and explanations? Perhaps religion doesn't cause as many wars as you think.

 https://www.youtube.com/watch?v=RxXkMnJdwy8

 

The Encyclopedia of War proves that only seven percent of wars throughout recorded history were religious wars. What about all of the other (non-religious) ideologies, political regimes, and tyrants that have tainted human history?