This is probably one of the weakest arguments evilbible.com makes regarding God's existence. It is an extremely obvious misconception and shows how little research the article writer actually did before they wrote.
They say God cannot exist because He is perfectly just (again limiting with the word perfect) and yet he punishes people eternally for finite sins that happened during their mortal lifespan. Furthermore, God couldn't be fairly punishing them because he created them imperfectly.
Quite a few obvious issues, see them? For one, Hell is a place without God's presence which is why it causes such suffering. God's presence is always around us here on earth, and is able to be around sinful creation because of the possiblility of redemption. When you die there is no more possibility for redemption, so you must go to a place without God's presence because an entity that is perfectly holy cannot be in the presence of imperfection. If you simply accept Jesus your sins become covered and you acquire ultimate and eternal joy through Jesus Christ. Not too mention I've already shown He didn't create us imperfectly.