[Dimensio]

It affects your morality, your understanding of man, and your understanding of yourself.

No, it doesn't.

THEISM may well affect a person's morality, understanding of "man" and understanding of the self. Atheism means that the influences of theism will not be a factor in said understanding.

I guess that you could call that affecting understanding, in the same way as not getting hit by a bus affects your odds of surviving throughout the day. I, however, don't consider the abscence of influence an effect.

[Dataman]

THEISM may well affect a person's morality, understanding of "man" and understanding of the self. Atheism means that the influences of theism will not be a factor in said understanding.

Think of it this way:

UNDERSTANDING	AFFECTS THEIST	AFFECTS ATHEIST
Man	Imago Dei	an accident
Morality	God's	society's
Human nature	Sinful	good
Nature	Directed	purposeless
Death	transitional	permanent
Personal life	Purposeful	meaningless
Human life	sacred	man is animal