There are Atheists who rule out GOD. Period.
But what does that have to do with Evolution?
I think it's great that you are starting down this path. But where you need to concentrate are on Atheists to convince them that there is a GOD (admitedly a daunting task) and Creationists who insist that Evolution = No God.
One thing that has always helped me is to simply look at the products that might have been created by GOD.
On one hand are a bunch of objects, poorly designed, many failures that went extinct and even those that have survived, cobbled together with makeshift and jury rigged systems, with bits and pieces left over like the apendix, with no padding on the shins, hair that falls out, eyesight that fails, subject to wear, tear and desease.
On the other hand are a set of rules, interactions that work wonderfully, forces and laws that regulate everything from galaxies to light itself. The more we learn about these rules, the beauty that is a crystal, the wonder that is gravity, the forces that hold the electron away from the nucleus, string theory and branes, the adaptability that is Evolution, the more awsome it becomes.
Of the two, poorly designed and patched KINDS or the symmetry, beauty, awesomeness and functionality of the underlying rules, which is more likely the product of a GOD?
Aslan is not a Tame Lion