Some atheists commit crimes, although hopefully not many. To commit a sin you have to be a believer. Atheists are not believers.
A small addition:
'To sin' means, 'to fall short' (like an arrow being shot at a target, and hitting the ground in front of it). If you didn't aim at the target, you can't fall short of it, so an Atheist can't be a heretic (although, in the past, this subtlety would not have prevented him/her being burnt at the stake).
I think the ultimate sin that we as Christians commit is Worry.
Sin + Religion
Some do, just like in many other sectors of society. To be an atheist you don't have to sign a pledge never to commit crime,
For an atheist, there is no sin in having a Christian friend. Nor should it ever be regarded as a sin for a Christian to have an atheist friend, a Muslim friend or, for example, a Buddhist friend. Surely the greater sin is for anyone to imagine that it is a sin to have friends who do not happen to share the same beliefs.
No, it is believed that in heaven, there is no sin or wrongdoing.
thou shalt not sin. it is a sin to commit murder.
There is no evidence that he was an atheist, but he was well known as a skeptic and, in Leonardo's day, disbelief in god would have been a heresy and expressing it extremely dangerous.
Greed
Yes, it is a noun. Heresy is a crime (sin) against the established church, such as failing to accept some doctrine that is espoused by the church.
not sure but it is a sin to commit suicide in Islam as is in Christianity.It's a sin in Islam to commit suicide
Corporate sin is when a group of people get together and jointly and knowingly commit a sin.
Saint Patrick did commit one sin. No one knows the sin he committed, but he committed the sin in his youth before going to Ireland.