I don't think I'm an atheist (I really don't know what I am, actually), but I will vouch for them for the sake of debate. hehe :P
but one part of this grains of sand, that someone made a very significant creation which is more viable to life..and that is the earth....so, of all this billions of galaxies in the universe why earth??..and who is that *SOMEONE*

?...had all the atheist here ever questions that?
All people, atheists and religious devouts alike, question... but clearly, the religious provide their own answers for their own satisfaction. They believe in a supernatural being responsible for all this and that IT is watching over everything in this universe. The feeling of security... that everything falls in its place.
Atheists on the contrary, continue to doubt. They won't find peace without the answers, and they're the ones not jumping to conclusions. They often think that the person's eventual preference of the "theory of a GOD" is a scapegoat- an illusion to make that person feel better of his existence in the universe. Atheists, however, open themselves to all possibilities- whether it makes them feel good or bad.
Isn't it funny that to freely choose whatever religion to believe in is divine, while for one to believe in whatever he chooses with the exception of religion, he is then called as someone who believes that he is his own god? It couldn't make them any happier.
But then again, most people are religiously affiliated. :P Everyone's a critic.