How much pain can atheists withstand ?

[Astreja]

My definition of evil:  Deliberately causing pain and suffering to a sentient being.

So, deliberately causing pain and suffering to the Nazis is evil ?

If it's possible to stop an evildoer without causing suffering to them, this is preferable to stooping to their level.

With this in mind, it's laughable, almost pitiful, to try and take the higher moral ground with regards to an all-knowing being.

Existential fallacy:  There is no empirical evidence that any all-knowing being exists; therefore, it's pointless to discuss its alleged morality.

Evil in its objective sense is unknowable...

Good and evil are value judgements.  Value judgements are subjective, not objective.  Morality that comes from a god is also subjective, not objective.

Long story short, there is no possible discussion in the first place, and at any rate, certainly not with an atheist or an agnostic.

Then why are you here?  This is a discussion forum for atheists and agnostics.