Why do Christians not kill people in other religions?

It's quite clear some of these pages were secretly put in by the devil because God wants to test everyone to make sure they are worthy to go to heaven. Although we are all created in the image of God so shouldn't we all go to heaven? And if accepting Jesus is the only way to Heaven does that mean that for all of the years before Jesus was around people went to Hell? And people who have never even heard of Christianity get sent to Hell too? But if God is all loving then why would he even have war and punishment? Of course maybe...