"In the name of religion" is a form of words that can mean digerent things to different people. "In defence of our religion" might be a better way of phrasing it.

In which case examples are hardly difficult to find, even in the present or recent times. Religion as such isn't the only factor in conflicts in, for example, former Yugoslavia, Ireland, Israel, but it's a very important element.   Bombing of abortion clinics is seen by those responsible as an expression of religious conviction. Indeed much of the support for capital punishhment in the USA appears to have a religious or quasi-religious basis.

At the same time religious principles can also be the basis on which principled opposition to war and violence is built. But those who see it that way appear to be a minority among Christians and Jews as well as Muslims.