Why are there wars?
Here's the answer:
There are wars because of the sin in the world.
All wars have one thing in common: people! As much as we all want to live in peace with each other, history shows us that people often disagree so much that it leads to hatred and fighting. When a whole nation is set against another nation, we might get a war. And sometimes one nation or people pose a threat to another people who feel they must defend themselves with a war.
It can be greed, hatred of other religions, or evil desires. In fact, Jesus describes the problem in the Bible with a list of things that can build up in people’s hearts: "What comes out of people makes them 'unclean.' Evil thoughts come from the inside, from people’s hearts .... So do desires that are not pure, and wanting what belongs to others. And so do telling lies about others and being proud and being foolish. All those evil things come from inside a person. They make him 'unclean'" (Mark 7:20–23).
God created a perfect place for us, but when Adam and Eve disobeyed God, sin and evil entered the world. As a result, we now have to live in an imperfect world. We still see lots of good in the world, but we also see lots of bad stuff and many wars are the result of evil actions of one human being toward another.
The good news is that God provided the perfect solution. He sent His Son, Jesus Christ, who gave His life on the cross and rose from the dead, defeating death and sin once and for all. So all who believe and accept Jesus as Lord and Savior are free from sin and the penalty of sin—death (Romans 6:23). This means we have a new beginning and now we can live a new life, following the teachings of Jesus and staying away from the old evil ways that lead to fighting.
So although wars are a terrible reality that we have to live with for a while, we have the great promise that all who come to Jesus will go to be with Him in heaven, a perfect place where there are no more wars or fighting and where there is peace for all eternity.
"Why do you fight and argue among yourselves? Isn’t it because of your sinful longings? They fight inside you. You want something, but you can’t get it. You kill and want what others have. But you can’t have what you want. You argue and fight" (James 4:1–2).
"He will wipe away every tear from their eyes. There will be no more death or sadness. There will be no more crying or pain. Things are no longer the way they used to be" (Revelation 21:4).