"because god said so"
This has to be one of the worst arguments to justify anything. But if you base your essays on the bible, you are entitled to a passing grade at the University of Oklahoma.
It’s honestly baffling that people who are otherwise considered intelligent still cling to the idea that there is some external authority in the sky: An all-knowing entity responsible for the entire universe, aware of past, present, and future and who will punish you if you don’t obey the specific moral rules it allegedly set.
I’ve been asked before: “Why do you care what other people believe?” Because these beliefs don’t stay private. They translate into real-world violence, subjugation, and death.
Historically and today, appeals to divine authority have been used to justify genocide, slavery, misogyny, homophobia, speciesism etc.
Why are you killing this person?
God commanded it.
Why can’t women go to school?
God forbids it.
Why are these people enslaved?
Scripture allows it.
Why are billions of animals bred, confined, and killed?
God created them to serve us.
At that point, morality stops being about reasons, harm, or justice, and becomes obedience to power.
Socrates has talked about this before: if something is “good” merely because God commands it, then morality is arbitrary. And if God commands it because it is good, then goodness exists independently of God, and invoking God adds nothing. [1]
Honestly, there’s a lot I could say, but it shouldn't take too much to tell adults that there's no sky daddy. Just grow up. There's no god.