2 Corinthians 10:3 For though we live in the world, we do not wage war as the world does.
There is a very big difference between the tools of war from this country (the UK) and the tools of war from a third world country from an age ago. We may have amazing technology to fight wars whereas they may have to rely on bows and arrows.
Just like there is that big difference between us and them, there is a big difference between how the world fights fights and how Christians should be fighting against evil.
God backs us every step of the way but he also expects us to stay within His rules when fighting on His side. Don’t leave God out of it, take Him with you!