On the very root of Materialism.

[Welsh cake]

One of the fundamental concepts in Atheism, or Materialism in general, is that life is only matter, leading to another concept: the only means of true knowledge is science, and if any claim is not scientific, i.e. material, evidence can not be considered true.

Fixed for you. Atheism is not a worldview, unless of course you meant to say atheists and materialists in general in which case that also works.

Now materialism is not self-contradictory, I don't know why you would say that, while it has had its fair share of criticism due to its shortcomings in defining matter and the scientific findings in physics such as Quantum mechanics and Chaos theory leading to modern day physicists rejecting it as a valid or meaningful worldview, but the philosophy of itself asserting the only thing that exists is matter doesn't actually mean it contains elements that contradict each other.

Of course attacking philosophical positions such as Materialism (and to go further Naturalism, Physicalism and so on) does not in anyway add any weight to the whole god hypothesis argument, if for example Materialism is proven to be completely false a god or gods are not then automatically assumed to be proven true, in that, it or they exist.