Hi FlyMario. Welcome to the Venganza forum. I don't know of any specific support groups relating to your problem other than this site, as this is the only place I know of specifically devoted to talking about Our Noodly One. I, too, am an atheist, as are many members here, so you are not in strange company.
Pastafarianism is, to me, an idea or a concept, and not a religion in the traditional sense. It's an identity that people can have that shows others that they believe in certain things (such as kindness, scientific enquiry, etc), yet without having the dogma that comes with many other religions. This is why we have the "I'd really rather you didn'ts" and not commandments.
Everyone is welcome in Pastafarianism, including agnostics, atheists, theists, polytheists, monotheists, and everything else under the noodle. We don't discriminate, and will talk on almost any subject. Some of us do get quite passionate about certain topics, as you will no doubt find out, but we try to keep such things professional and not personal (no ad hominen). Everybody, regardless of what they think, should have the right to air their opinions and discuss them.
So you see, there is no conflict between not believing in a traditional god and following Pastafarianism. I hope this goes some way to helping you resolve part of your conflict.
Roland Deschain - Half prophet, half gunslinger, all Pastafarian!
"Since Alexander Pearce escaped, over 250 people have disappeared in the Tasmanian wilderness. No remains have ever been found." - Dying Breed