Interesting, you see, I completely destroy your assertion here.Open to all atheists:
Atheists say they lack a belief in God.
God says that isn't true, that they do know of Him, but suppress that truth so they can continue sinning.
Now God, by His nature cannot lie.
But the atheist, appealing to subjective morality, is free to lie at will.
Therefore why would anyone believe an atheist who claims that they lack a belief in God?
I don't have sex, at all, I abhor it actually.
I don't lie, it's too complicated to keep lies straight so I just don't do it.
I don't steal, never needed or wanted to.
I don't want anything that I cannot achieve myself, my agnostic father was a firm believer that if you cannot get it yourself, you don't deserve it anyway.
I don't drink, being drunk is horrible to me, losing control of one's mind is something that frightens me.
Never done any drugs other than tobacco.
Oh wait, most of that is not considered a "sin" anyway ... and any action with negative impacts on society can be justified by the bible so meh. Seems I am actually "purer" than even the christians. Wait, what was your point again?