It is only fair I take the time to answer my own question. It was interesting to see the varying replies and the reasoning you gave as you contemplated the scenario in the OP. Sadly, there have been many who did not have the fortune to just imagine the scenario.
Jesus said that love among his followers would be the key identifying mark of true Christianity:
"
By this all will know that you are my disciples—if you have love among yourselves.”-John 13:35.
On the night before Jesus was put to death as he was being betrayed Peter pulled a sword to protect his master and cut off the ear of Malchus. Jesus reached out and healed the slave's ear, then told Peter:
“
Return your sword to its place, for all those who take up the sword will perish by the sword."-Matthew 26:52.
Jesus also made this statement about his followers: "
They are no part of the world, just as I am no part of the world."-John 17:16.
A true Christian is a follower of Christ. He was peaceful. When Pontius Pilate asked Jesus if he was a king, Jesus replied that his kingdom was not from this source. That is earthly. He was letting Pilate know he did not have to worry about Jesus trying to cause insurrection or sedition as was falsely being charged. In fact when they tried to make him king he refused.
But Jesus is now reigning as king in heaven. And he has the legal claim to rule the earth. His father has given it to him as scripture promised:
Let me proclaim the decree of Jehovah;
He said to me: “You are my son;
Today I have become your father.
Ask of me, and I will give nations as your inheritance
And the ends of the earth as your possession.
-Psalm 2:7, 8.
The Bible says that all human governments are in opposition to God's kingdom rule and thus will be done away with. A Christian is a citizen of God's kingdom and thus does not take part of the wars of earthly nations.
Jesus' real followers, the Christians in the first century did not remain soldiers after becoming his followers, and it was unthinkable for them to take part in the wars of this world:
The
Encyclopedia of Religion and War states: “The earliest followers of Jesus rejected war and military service,” recognizing those practices as “incompatible with the love ethic of Jesus and the injunction to love one’s enemies.” Likewise, German theologian Peter Meinhold said of those early disciples of Jesus: “Being a Christian and a soldier was considered irreconcilable.”
https://www.jw.org/en/jehovahs-witnesses/faq/why-dont-you-go-to-war/
There was a thread posted yesterday by the user Psalm23 asked "What is Love?"
True love is being willing to surrender your life for your friends. Refusing to kill them because they are of different national or ethnic backgrounds.
And it is only the meek and those who have love among each other that will inherit the earth.
Now, instead of people of the same faith and beliefs fighting and slaughtering each other, imagine them all serving the true God Jehovah in peace and unity and love.
I thought the following is quite appropriate to the subject. Please watch and see how people of all walks of life, all nationalities, all races can live together in harmony and peace. Displaying the true identifying mark of Christianity, and of their God Jehovah, love: