In these times we often hear that Islam is a hostile religion, that the Qur'ān teaches that all non-believers should be killed. Well, I haven't read the Qur'an my self, but I found an interesting quote in sura 60, verse 8 and 9:
GOD does not enjoin you from befriending those who do not fight you because of religion, and do not evict you from your homes. You may befriend them and be equitable towards them. GOD loves the equitable.
GOD enjoins you only from befriending those who fight you because of religion, evict you from your homes, and band together with others to banish you. You shall not befriend them. Those who befriend them are the transgressors.
In other words, you may befrend those who are not hostile to you but you shall not befrend those who are not. Seems reasonable enough?
Sura 60, verse 8