Most of us would decide to break in, take the food, report what had happened to the police, and give a generous cheque to the owner. We imagine nobody in their right mind would call that stealing. But even Atheists have some supreme value. Where there is emperor worship, as in the Roman Empire, Christians were accused of having another god and thrown to the lions. Marxists tried to root out all other religions.
Atheists easily condemn the meaningless rituals of religious people.
But they forget that they are indirectly assenting to the second commandment which specifies not making idols or images for the worship of God. Whether or not they believe in God, all people approve of some kinds of behaviour and disapprove of other kinds of behavior under each of these headings, but they have very different ideas about the exact content of what each commandment should include. This should not surprise us because, although the commandment is given in the form of an absolute, the specific details of what it means is left for us to fill in. What has to be filled in by moral discussion is whether or not this particular act in this particular situation comes under the prohibition. If our own culture has remained stable as long as we can remember we easily assume that moral discussion is not required.