Western morality and civilization comes from Judeo/Christianity.
That's just where is comes from.
Atheist may adopt it, but it didn't originate with them. It didn't come from the Greeks or Persians or Indians or the Chinese.
Our morality came from Judao/Christianity.
That is the foundation of the Western world.
I agree with Mairdie that there are many atheists with the highest ideals and values - Good People who add Life Love Beauty to the world (which I’m certain Mairdie herself does.)
And I wonder if our Judeo-Christian traditions were actually ‘new’ themselves. They may have been re-iterations of previous understandings, repeatedly stepped-up and tailored to new conditions and awarenesses...the same message being repeated over and over, through cycles, to meet new conditions as receptivity/consciousness evolved.
I believe in God, and I can’t believe that He has only one way of bringing people to Him and to greater Life.