Another hostile attack

With a very bad move from the terrorists by attacking some churches in Baghdad, one of the churches which attacked was near my school I don’t know if my friends were in there that time because I have a big number of christen friends and I hope they are safe now, but lets move back what is the goal by attacking these churches why they attack a place which people go to pray and wish that their lives will continue happily, why the terrorist want to bomb them (WHY?) I mean if they are fighting to liberate Iraq as what they say so what is the purpose by bombing these places is that Jihad? Its not it is completely not I mean in Islam it's not allowed to go and kill the people even if they are not Muslim people it's NOT ALLOWED also it is against human rights, I mean what did they do? Why those people deserve to die? Its shame of them to kill people who they have nothing to do relate with occupation like when they kill those who work with the American's army they kill them because they work with the occupation as what they say, but about those people who just died today is their only fault was they were Christian people not Muslim people. If we take an example of one of the world's counties do their people who they are Christians kill Muslims people? They don’t because they are living safely together no one have to die no one have to suffer, why in Iraq they have to…… I don’t know what to say but in this situation I can't live my life.