I don't think that's a fair definition of atheism. Or agnosticism. Atheism is about the rejection of a belief in a god or
gods. The type of atheism you describe is philosophical atheism based on an empirical/materialistic world view which in turn is likely to lead to a rejection of certain values of God, but in principle you can believe in spiritualism, astrology, reincarnation, pixies, homeopathy or that Newcastle will win the Premier League and still be an atheist.