Sura Q4:71ff take up once more "fighting for the cause of God." And it seems unambiguous that to fight on behalf of God is more than acceptable. Now this passage may have been recited during the Medinan period when there was back and forth fighting between Muhammad's followers and the powers of Mecca. When battles are engaged the better portion is to be in the battle, even if you die. Better to die as a martyr in such a battle than to hang back and preserve your life. For Muhammad that is a sure path towards the "Fires.
Sura Q:76 ends with, "Those who believe fight in the way of God, and those who disbelieve fight in the way of al-Taghut. So fight the allies of Satan! Surely the plot of Satan is weak."
This passage was given in the midst of Christianity's encouragement of the Frankish Kings to conquer and reestablish a Roman like empire. So while it may color our view of Islam in the present crisis, the sentiment, by itself, is no more inflammatory than Christian exhortations praying for military victory.
Muhammad is astonished by the temerity of some of his followers. They cling to this life and world and risk their place in the eternal Gardens. From Q4:79-83 he continues to rail against those in the community who conform publicly then retreat privately. In 82 he writes, "Do they not contemplate the Qu'ran? If it were from any other than God, they would indeed have found in it much contradiction."
Again in Q4:84, "Fight in the way of God! You are only responsible for yourself, but urge on the believers. It may be that God will restrain the violence of those who disbelieve. God is harsher in violence, and harsher in punishing."