First of all, I should disclose that I am not atheist nor agnostic. I believe in a greater being, but I also believe in our need to apply science to find answers.
The video below is by Philhellenes, an atheist who presents an argument for science titled "Science saved my soul...from religion."
You can view more of his videos on his YOUTUBE webpage at http://www.youtube.com/user/philhellenes.
Visit my website at http://photographywritingandmore.blogspot.com/.