‘Apart from a transcendent God what makes anything “right”, “wrong” or “evil”?’
think of whatever it is that you would not want others, in the normal course of events, to do to you, and thus refrain yourself from doing likewise to those others...’right, wrong, or evil’ is breaking that simple code...
If there was no God what would make that true? The big fish eat the little fish - are big fish evil? God is what makes the golden rule an aspect of morality. Apart from God, might makes right and what's right is what you can get away with.
“...think of whatever it is that you would not want others, in the normal course of events, to do to you, and thus refrain yourself from doing likewise to those others...”
Yes - the Golden Rule is certainly a great idea.
Unless of course one fantasizes about homosexual gang rape in the showers at the I-80 truck stop.