John Shea has written about the effects of a rejected heart. In it I see the atheist’s world-view as s/he rejects both Creator God and the effects He has on those who commit their lives to Him.
For example the atheist sees:
. Christian sacrifice or dedication and chalks it up as guilt.
. The atheist is witness to Christian charity and sees condescension toward the poor;
. Powerful preaching - obvious manipulation;
. Conversion of mind - rationalization;
. Peacefulness - ennui;
. Love of neighbour - self-interest;
. Friendship - opportunism.
The excitement for Jesus of the old is seen as pathetic;
The exuberance for Jesus of the young is seen as immature;
The steadiness of faith in Jesus of the middle-aged is seen by the atheist as sheer boredom.
Titus 1:15 - To the pure, all things are pure, but to those who are corrupted and do not believe, nothing is pure. In fact, both their minds and consciences are corrupted.