I don't believe in God, so when I'm horny I just find a nearby woman and rape her. Oh wait, no I don't.
You can't just make stuff up and pretend it's true. In this case, you claim that lacking belief in God would cause one to act completely impulsively like animals. Newsflash, there's a real world out there for you to look at! If you actually talk to nonbelievers, you'll learn that most nonbelievers are very considerate people who have a strong sense of right and wrong just like believers.
You want to hold onto this idea of God so badly that you deny reality to preserve your own ideology. That is to say, you want to believe that nonbelievers have no reason to act good, therefore it's what you believe despite reality completely contradicting this claim.
If the Bible told you all nonbelievers ate babies and beat puppies with bats, you'd be inclined to believe it since you have this preconceived notion that the Bible must be true. It wouldn't matter if there was no evidence to support the claim, you would just accept it as true.
This is what you're doing here. You're looking at nonbelievers as predators, enemies of Christians. Why? Real world observation? No. You see nonbelievers as wolves simply because that's what the Bible declared nonbelievers to be. And I know, you'll likely point out to ways in which nonbelievers have attacked Christians - but I can just as easily show examples of the reverse. Overall, most people leave each other alone and the claim that nonbelievers are like wolves is fear mongering.