[timm22]

Whereas Christians and the faithful of other religions have good reason for attempting to live by the Golden Rule – they are commanded to do so – the atheist does not.

So the author is saying the reason to follow the Golden rule (and presumably the rest of religious ethics) is because God commands us to?

Why must we obey God's commands?

[Tribune7]

So the author is saying the reason to follow the Golden rule (and presumably the rest of religious ethics) is because God commands us to?

Yes.

Why must we obey God's commands?

Because God wants us to.

[Heartlander]

Why must we obey God's commands?

You don’t…

In fact, you can choose not to obey any commands from anyone.