Atheists are insistent that Atheism is non-belief or non-faith. Philosophically, this is illogical.
For the statement "God exists" (GE) to be true, "God doesn't exist" (GE-not) would be the opposite and untrue.
For GE to be not true, GE-not would have to be true. That makes GE-not a positive assertion, subject to the same burden of proof as GE.
Atheists counter with "You can't prove a negative. That's illogical." DING! That's the very atheistic definition of "faith"... believing in things you can't prove.
The Atheist will counter, "but belief in non-existence is the 'default position'".
Agnosticism or ignorance is. Atheism is a stand which claims the polar opposite, theism, is false.
Atheism is a positive truth claim, and not an end in itself.
It is all explained quite simply in four essays by a philosopher. Check it out: