>>510895233 (OP)If God isn't real (good luck proving that to yourself) you can base your rules and regulations on literally anything you want, but what you cannot do without contradicting your position as an atheist is to claim that anything is good or evil because in such a scenario every man's opinion would be every bit as valid and as authoritative as the other, and all it takes is "because I say so" to dismiss any suggestion of holier than thou. E.g:
. Person A says we should ban sex with children.
. Person B says we shouldn't.
. Person A says "That's evil".
. Person B says "Banning sex with children is evil".
. Person A says "That's crazy, children suffer during sex".
. Person B says "Suffering is good".
. Person A says "Then would you like to suffer?".
. Person B says "No".
. Person A says "Then why allow children to go through that?".
. Person B says "Because I don't care, and you should be killed for attempting to take kid pussy away from me".
...so forth and so on.