Why is the Christian perception of atheists that of an immoral, careless being?

I am atheist and I believe that I am a very moral person. I think the 2 things have no connection, however your right Christians believe that they co inside. I think that no matter what religion you are you should always respect other peoples opinions. that doesn't mean you have to agree. I think people who are very religious are easily persuaded into believing what they are told. For some reason they need to feel connected to something. I wouldn't take it personal these things are things they were taught and they are too naive and desperate to conform to question it. The only thing i cant understand is intelligent people who buy in with no hesitation