I have debated this topic so much, and I followed debates about it so much, that I feel tired just thinking about it.
Fact is, I have grown up in a very strict Christian society. South Africans take their religion quite serious. What I have learned about religion is that people don't need to know God, to follow His basic rules.
I know quite a few atheists, that I regard as better persons than many Christians I know. The sad thing is when Christians start pointing fingers, and thinking they are better for believing in God.
One thing is for sure. There is no conclusive evidence that there is a God, and there is no conclusive evidence that there isn't a God. The Bible is written by men, and they made quite a few mistakes.
Also, today Christians pick and choose what text in the Bible they like and which not. Some of them judge other people simply based on their religious affiliation. That is one of the biggest mistakes Atheists and Christians alike are doing today.
I have learned that you should rather get your own house in order before trying to point fingers or blame other people around you for the things that goes wrong in your life. Ignore their religious affiliation and rather concentrate on treating people like you would like to be treated. It is quite simple actually.