If everyone in the world lived by the 10 commandments, the world would be very different. But they won't, so nothing will change. The commandments are broken regularly, even by those who believe in them. Some people keep them who don't believe in them. In fact, belief has little bearing on whether or not they are kept, so they are, in fact irrelevant.

The first four commandments have nothing to do with virtue or evil, they are simply religious instructions. The rest of them are just good common sense rules for living in any community, and even most atheists probably do their best to observe them, although almost everyone, religious or not, has violated several at one time or another. At least one commandment is impossible to keep, no matter how hard you try, the one with the "covets". How can you help coveting something? All you can do is refuse to steal it.

Commandment 6, about killing, probably the most important one, has multiple exceptions, even for those who subscribe to the program, and this is just by our rules, other cultures play this game differently:

1) You're allowed to kill in self-defense
2) You're allowed to kill in the defense of others
3) Your're allowed to kill other species (this one's impossible to avoid!)
4) You're allowed to kill enemy soldiers in wartime
5) You're allowed to engage in activities in wartime likely to result in the death of innocents, as long as you don't target them specifically.
6) You're allowed to kill justly condemned criminals.

I could go on. On the other hand, you're NOT allowed to kill people in hideous pain, even if they beg you to do so. And you are not allowed to kill yourself, the ultimate right of every sentient life form.

And finally, the most important commandment of all is missing from the list altogether: Thou shalt not cause pain to another human being. Where is the commandment against torture?

The point I'm trying to make is that even a highly respected and long-lived moral code like the Big Ten is riddled with exceptions and omissions
and practical problems. Like all ideologies, it may be a useful guideline but not an absolute. Morality is relative. There is no set of rules that will guarantee virtue or evil depending on whether or not they're followed.