Atheism is scientific.
No. It isn't.
It rejects unknowns until proven.
No. It doesn't. Science embraces the unknown. If it rejects the unknown, it is committing the same anti-scientific logic atheists accuse religious people of committing.
Atheism is not a gnostic worship of nothingness
Nope. It is an irrational fetishization of something's non-existence.
Atheists often understand religion more than many religious people,
Good thing you told me... I would never have been able to tell by all the atheist shittakes I see.
What are Atheists not getting?
Is it really this difficult? Are there no religious people in your family?