That is what many of the early Christians did - check history.
Therefore, it is pro-life to wage a war on terror against those who killed 3000 on 9/11.
That could be true regarding our military assistance activity in Afghanistan against the Taliban. It is not true regarding our invasion of Iraq. The leaders and citizens of Iraq were virtually uninvolved in the attacks of 9/11. There are several other countries that were much more involved but we did not invade them. There are many other countries in the world with evil dictators but we did not invade them. It is not pro-life to arbitrarily initiate violence and wage war on a country we don't like. This also involved a violation of our constitution - which I explained in an earlier post.
And many Christians were also in the Roman Army. They fought against enemies of the state and against criminals. Paul affirms such behavior in Romans 13.
Christians gave their lives in defense of their faith because it is contrary to the Lord's will to advance Christianity through military force & coercion.
You don't draw the correct distinction between faith, on the one hand, and community security, on the other.
So far as 9/11 is concerned, Iraq was up to its eyeballs in international terrorism and terrorists. It was up to its eyeballs in WMD R&D and maintenance of small amounts deliverable by terrorist agents.
The Sep 18, 2001 authorization by Congress allowed the President to go after anyone in his estimation who aided, comforted, supported, in any way was connected to the 9/11 terrorist network.
That would include Iraq.