We have all experienced its misery. We have all felt its reproach. That is the one thing that no human being has ever been without and that includes me.
There are umpteen varieties of sin ...
Try to overcome your ignorance, then you'll realise that it's only make believe and there's no need to worry about praying or so-called sinning.
Denial of your crimes against others will not get you off before the law. It will only cause the Judge to make your sentence harder.
Denial of your sins will not get you off before the Lord. Likewise, that will only add intent to the crimes for which you will suffer.
Bitterness, disregard for the human rights of others, games, and hatred, are atheist faults. There is therefore no excuse for atheism or any of its evils.
In Jesus' Name, I bid you warning.