Nobody can fight for God. He alone fights His wars and for us. This is the only Holy War. No human has ever fought holy war, even when they were sent by God to kill and destroy nations.
If you believe this, sorry, but those of Divine mission for war are over. God no longer send people to kill and destroy their kind, but to save and love them no matter how they are. We now value lives more. The Muslims are too extreme in their voracious actions. Repent. Change. Islam is not the only religion around. Calm.