As a practising Christian, I agree with John P. Ron, if when you say atheists don't admit 'their belief is based on faith' I feel you are confusing several different meanings of "faith". For example, if what you mean is 'their belief is based on axioms that cannot be proved', then so is mathematics, for example. Most people believe that if they hold an object at arms lengths and let go it will fall, but that is not usually regarded as 'a faith'. In fact, you make the statement empty of meaning because it encompasses everything. But while a logical system based on a small number of axioms could be a faith (eg Axiom 1: The Bible is always literally true), the vast majority of such systems lie outside any conventional meaning of 'faith'.