It seems that the right of freedom of speech that was enshrined in numerous constitutions is now under attack by religious institutions.
I think if we wish to live in any kind of a moral universe, we must hold the perpetrators of violence responsible for the violence they perpetrate. It's very simple. The criminal is responsible for the crime.
But there's one thing we must all be clear about: terrorism is not the pursuit of legitimate goals by some sort of illegitimate means. Whatever the murderers may be trying to achieve, creating a better world certainly isn't one of their goals. Instead they are out to murder innocent people.
Islam is unusual in that it's the only one of the great world religions which was born inside recorded history. That there's an enormous amount of factual historical record about the life of a prophet and about social conditions in Arabia at that time. So it's possible to look at the origin of Islam in a scholarly way.