Make no mistake there is really NO reconciliation between Christianity and Islam in terms of religion. Both are contradictory, not complementary. However the holy war between Christians and Muslims can be fought in these ways:
1.) Ephesians 6:12-19 and 2 Corinthians 10:4 present the reality that the warfare between Christians and other religions is NOT bullets, guns, bazookas but the matter of saving people from eternal damnation in Hell. Every Christian must realize that the war is for the souls of Muslims, it's against Islam and not its followers. They are not to go around blowing up Mosques. It's MISSIONS and NOT MISSILES and it's BIBLES NOT BULLETS! Jesus sent the Apostles to evangelize not to exterminate. Wherever they went, they accepted persecution and preached! Christians must keep evangelizing to Muslims the folly of their religion and that Jesus is more than willing to forgive them, that He is more than a prophet and that He is the Son of God! Preaching to Muslims and getting them converted to Christianity will cause Muslim armadas to lower down in numbers!
2.) Accept persecution and death if need be. The Church won its war against false religions also by martyrdom. The blood of the saints only made the Church grow. Islam had a record of persecution of Christians yet Christianity ends up growing strong even in places like Saudi Arabia and Libya. The more Christianity was persecuted, the more it grew instead. When Christians will even bravely face death for their faith, they have given Muslims who are told by their Mullahs they can't be sure of their salvation something WORTH DYING FOR!
3.) Show Christian kindness to Muslims in need of help. Jesus preached to Christians to LOVE THEIR ENEMIES! Romans 12:20 and Proverbs 25:21 tells Christians that if their enemy be hungry, give them food and if they be thirsty, give them drink. Being a good Samaritan to Muslims does make a difference than just plain evangelism. While Muslims are not allowed to help infidels, Christians are commanded to help infidels aside from just Gospel preaching! However one must NEVER forget to share also the message about Jesus to the unsaved!
4.) Military warfare is the last resolve and for defense reasons only (that is against life threatening danger). Remember bloodshed is only to be used defensively. Jesus clearly approved of self-defense but NOT murder. Those are two different things.