Not really. Just addressing your (faux) point 'that abolition was led my Christians'.
The Christians were deeply divided over slavery and only a subset (Congregationalists, Quakers, Mennonites, Free Methodists , Unitarians, etc) were actively involved in freeing slaves and getting them to safety.
... Lots of writing, none of which addresses that fact that Atheists regimes have slaughtered more people than all others combined.
One of Communism's hallmarks in the Soviet Union and China was its aggressive and violent suppression of other religions. Communism was "anti-religious" only in the sense that it forcibly suppressed all religions other than itself.
> atheists like Hitler, Mao and Stalin, than all religionists combined, they'd rush to outlaw atheism instead.
So you'd like to 'outlaw atheism'?
Hmm ...