What Christian religion doesn’t engage in warfare?

My church.  We don't declare wars, but we do believe in serving our country when called upon to do so.

Biblical wars.

Crusades.

Dark ages.

Reformation.

Stalin was raised a Catholic, trained for the priesthood and controlled the Russian Orthodox Church – in the top ten of Christian denominations. Lenin was a baptised member of the Russian Orthodox Church and never ventured to go beyond the opinion that the Church and the clergy were part of the ruling classes, - Marx was a lifelong Christian and is buried in Highgate cemetery in London. Russia has always been Christian which is why St Basil’s Cathedral is at the heart of the Kremlin!

Hence today I believe that I am acting in accordance with the will of the Almighty Creator: by defending myself against the Jew, I am fighting for the work of the Lord. - Adolf Hitler

My feelings as a Christian points me to my Lord and Savior as a fighter.

- Adolf Hitler

As a Christian I have no duty to allow myself to be cheated, but I have the duty to be a fighter for truth and justice... And if there is anything which could demonstrate that we are acting rightly it is the distress that daily grows. For as a Christian I have also a duty to my own people. - Adolf Hitler

George W Bush started FIVE wars in less than eight years stating each time that it was his "God Given Duty” and in 2001 even called it a Crusade!

Not his duty to the electors!

Not his duty to America!

Just his duty to keep slaughtering heathens for his god!

Look at all the terrible intolerance, hatred, bigotry, homophobia and persecution posted by Christians towards others! 

Christian pacifism is the theological and ethical position that any form of violence is incompatible with the Christian faith. Christian pacifists state that Jesus himself was a pacifist who taught and practiced pacifism and that his followers must do likewise.

None. Christianity teaches us to defend the innocent if we can, and stand up against the foes of our faith. (Jehovah's Witnesses are not of the Christian Faith.) 

Lol....I just read JW BJ's answer and true to form, parroting nonsensical cult speak. Bravo, Bill for another watchtower propaganda copy & paste.

Amish, Quakers, SDA, certain Mennonotes, Church of the Brethren, Society of Friends, Hutterites,  and others in the Anabaptist tradition, Doukhobors, Molokans, Bruderh of Communities, Schwenkfelders, Moravians many groups of Brethren, and many groups within the Pentecostal movement.

Isn't it funny how the jehovah's witnesses claim to have the monopoly on pacifism?

There is

by definition

one and only one Christian religion.

Namely: Christianity.

Several Christian sects and denominations teach a strict "being a soldier or otherwise being a combatant in warfare is a sin" policy to their followers

including (but not limited to) Quakers, Jehovah's Witnesses, Seventh Day Adventists and others.

The Amish, Mennonites and the Friends [Quakers].  Probably others I don't recall.

Jehovah's Witnesses, but I don't count them as Christians. Still, they are pacifists.

Which Christian denominations? Anabaptists, Amish, Mennonites, Hutterites, Jehovah's Witnesses and Quakers come to mind. Might be more.

JW's do not go to war and a few other religions do not go to war and kill their brothers.

true Christians, who have their conscience trained by the Bible, do not learn war or participate in warfare.

professed Christians often go to war against members of their own faith. Catholics kill Catholics on battlefields. Protestant kill Protestant.

a hundred million people have been killed in the wars of this 20th century, and all those wars have been supported by the religions of this world.

As a result, religious people have killed other religious people.

Much of the time, they have killed people of their own religion. 

Rather than encourage love for one’s brother, the churches have supported and even promoted the killing of one’s brother in war.