Wow! to compare killing and shunning, that’s a desperate act of a faithless person. Even the 10 commandments attested to that. You are correct, you know nothing about man’s laws and how there implemented, and even less about true religion and how religions need to conform to the laws of the land to be active in that society.
So continue to impress your audience, you have the last word, enjoy your European life. However, I don’t believe your Europe is better than anyone else.
Excommunication is really a kind of banishment, a punishment that's handed out by a church when one of its members breaks some important church rule. The Latin root is excommunicare, meaning "put out of the community," which is just what happens when a person is excommunicated.
ex·com·mu·ni·cat·ed, ex·com·mu·ni·cat·ing, ex·com·mu·ni·cates
1. To deprive of the right of church membership by ecclesiastical authority.
2. To exclude by or as if by decree from membership or participation in a group.