[Dimensio]

Atheists and this court are not under god, but claim to be above god or equal hence!!!

Atheists lack belief in gods. An atheist could comment on their opinion of a particular god construct, but it would always be hypothetical because the atheist would not actually hold belief that said god exists.

"Sin" is actually a concept of religion, thus they lack belief in sin in general because of not believing that there are any gods against which a "sin" could be committed.

[GulliverSwift]

"Sin" is actually a concept of religion

This is true in the original sense of the word, however, this word has many meanings (see m-w.com) one of which is "an action that is or is felt to be highly reprehensible c : an often serious shortcoming : FAULT"

In this sense of the word, one may clearly believe in sin without having a belief in divine laws. Sorry for the quibble :)