When typical atheists try to logically explain moral actions in practice all they're talking of really is self interest. Ask them about the ethicality of veganism and it turns out that morality is really just a nice word for self interst.
When you ask a christian about how one determines if an action is moral, it's just a matter of doing as one is told (along with interpreting what one has been told...)
It is a lie for such atheists to use words like ethics and morality. The christian can at least use such words, although they can't back it up with a very good reason why.
It looks like that old ugly idea that atheists are evil, which isn't actually the case at all. Because actually they do moral actions (not in their self interest) all the time. Because actually they don't truly act like atheists. In fact it's not actually possible to live like an atheist.
In fact they are more moral generally than christians as they are open more to the questioning of ugly traditions generally. And whether or not they are vegan they do act in ways that are outside of their self interest... occasionally. But whenever they do so they are going outside of atheism. They are not living as an atheist. But then when they get out of bed in the morning they've already ruined that.
...but that wasn't the point. The point was the lie. Christian ethics can't be taken very seriously. That leaves these attempts at logic which reduce to self interest yet are called ethics. It is a lie upon which our society sort of wobbles... Wobbles as although that's about the best people can manage to express/argue about, there is something very real other than that which is going on, which is making us act in ways that cannot be brought back to self interest or "god said so".
But it is such a hazy, fuzy, haphazard thing which is going on; a thing that these people can't express, s that of course we mostly do just act in our own self interest. A very short term self interest.