Explaining the position of an atheist is a difficult task because it's a position with an absence of something, and it's a position that is so simple and clear you've got little to substantiate your argument with. If the glass is empty, the proof is that there isn't anything in it. There is no water in it, there is no juice, no soda and no milk filling up the space between the edges.
Being an atheist means that you've looked at all the religions and have come to the conclusion that none of them are in the glass. And as such, you've made the profound realization that there is actually no reason as to why there has to be something in the glass at all. Indeed, the glass is perfectly fine being empty.
It's easy to believe in things that comfort us, "live a good life and you'll be rewarded", but that doesn't make them true. Being truly strong is to be able to accept the truth, no matter how disconcerting it may be. Relaying on a religious doctrine to run away from the problems of the real world is a practice for the weak of mind and a major reason for the problems not just remaining, but multiplying as well.
Becoming an atheist has not changed a single thing in my life because I was always an atheist. But it's important to understand that I do not live my life the way I do because I'm an atheist – I'm an atheist because of the way I live my life. As a lifelong intellectual, atheism is simply the natural way of looking at specific question.
I am, however, saddened by the problems most people cause both for themselves and society as a whole because of their unfounded beliefs. Religion is not the true root of those problems but rather an opportunistic infection that ensures critical reasoning skills never enter the public mind lest they'll understand the damage they cause.