what do you consider morality?
what if we arnt supposed to have sex out of marriage because its healthier.
what if we dont kill because its safer to live that way.
what if we dont steal because we wouldnt like to be stolen from?
"what if" morality was a human theory designed for better living.
would that then make morality materialistic?
Well, materialism is the theory that all that exists is matter. So, a true materialistic view of morality cannot say what people "should" do, only what people do, as dictated by the particles bouncing around in their head. So, that would mean "morality" is only a set of human conventions which have arisen (evolved) to improve survival. If a materialist is logically consistent in this regard, they will be completely amoral, since there is no logical reason to judge between these conventions, or to judge a departure from them. To be a nazi should be just as fine as to be a philanthropist -- both are simply the result of natural processes. I find that materialists still get pissed when someone intentionally stomps on their toes though, so go figure

. I guess the particles made them do it.
since you can neither prove nor deny the origin the whole theory of rights becomes just an illusion.
There is such a thing as evidence which does not rise to the level of proof, and there is such a thing as a reasonable, unproven idea. I believe one can prove the non-physical exists, and that there is evidence, but not proof, of God. If you actually relied only on ideas which could be proven, you wouldn't get anywhere -- you couldn't even believe your own senses.
why do you keep saying atheist also, i dont believe in a god but im not denying he isnt real, how am i to know? if i was to make assumptions and credit their existence to chance then a lot of things i believed in would strongly be my imagination.
Do you believe people are only matter? If so, then there can be no special distinction between us and the animals (or your chair for that matter). Most people who hold this view are also atheists, since it would be odd to assume that people are purely physical, and then propose the idea of a non-physical god or spiritual world. That's why I call this idea atheist, but perhaps I could have been more accurate.
If you do not hold this view, you are not a materialist, although you still may be an atheist. That would mean you believe non-physical things exist -- most notably human minds -- but that there is no greater mind in charge of things.
If you believe there is such a greater mind, then you are not an atheist.