Yes, if the cause of war is just (which in this case I believe it is.) Christ died for the ungodly. Every human being is made in the image of God.
But not every human being is a child of God. You are only a child of God if you become a Christian.
John 1:12 - "Yet to all who receive him, to those who believed in his name, he gave the right to become children of God..."
Ephesians 1:4-5 - "In love he predestined us to be adopted as his sons through Jesus Christ."
So, spiritually speaking, my "brothers and sisters" are felolow Christians.