Atheists are people who don't believe in God or any other gods. In short, they are the one who don't have a religion.
Since I have read many posts contradicting(that's what I thought) other religions here, especially Christianism. I really do believe that these people are Atheist. What is your religion when you were born? Where do you really believe? Science? And, when and how did you became an Atheist?
I was raised as a Catholic.
I don't see the need to choose between science and belief in God.
I was never an atheist, I was agnostic for quite a long time. Even though I was raised in a Catholic household and went to Catholic schools from 1st grade all the way up to and including my under-grad studies I never saw any evidence that God existed. I didn't really believe until I was in my 30's.