We often listen to Christians who say that atheists are immoral because there is no moralality without divinde definition of good and evil. But I say it's the opposite - it is christianity that makes you immoral. Here's why:
1. Christianity teaches you that the world is an evil place controlled by Satan and therefore Christians should not be of it.
2. Christianity teaches you that you can do whatever you like as long as you accept Jesus Chrsist as your Saviour.
3. Christianity teaches you that Heaven is only for Christians. Some denominations like the Orthodox, the Catholic and some other churches believe that salvation is only for their followers and all other people go to hell. When you learn from a young age that most people you see are doomed you become indifferent toward their problems.
4. Christianity teaches that it's better to be murderer than an atheist because unbelief is the greatest sin. Blind faith is more important than ethics. That's why most criminals are believers.