SEAGOON,
I can't speak for other Atheists as we are all different, I can only speak for myself.
Yes, in the end, on a personal basis, it does not matter how I lived after I'm dead.
I don't need to have a belief in a God/Supreme Being as I just don't believe in its existance.
HOWEVER, what defines me as a person, a citizen is how I treat others and who I am while alive. After I'm dead, it will not matter to me as "I" will no longer be here, nor will I have the capacity to care. I will be dead. I am as sure of that as I am sure that there is no God/Supreme Being, that I need air, water, food, rest, etc. to survive in the meantime.
My path is a very personal one as it has to be.
Obviously we all here have different life's paths that we have chosen and will follow.
Do I see your different path as a wrong one? Not at all for it is your own, and is very personal.
As long as you do good and do not harm me, my family, my friends, etc., I will wish you well your journey through life.