I think that evil is an important concept, moral nihilism is a road I went down, and to paraphrase Nietzsche;
I stared into the abyss and the abyss stared back
The way humans perceive reality is driven by abstractions and delusions. None of them are real, but in some cases they can be very helpful and not by accident either.
A philosophy, even if it believes in something not real (which atheists do as well), can inform us about modes and patterns of behavior consistent with our ends.
In other words, I might believe in Jesus, who is not real, and follow what I believe to be his ethic, which has real positive effects on my social relationships and life. You could get there another way.
Worrying about which totem or belief system is best aesthetically avoids the real question.
"Will this belief system produce results consistent with (my definition of ) a happy and healthy life?"