Atheists write about Christianity because it interests them. This raises the question of why Christians write about atheists.
The link is one such example. The writer says atheists have no moral grounding and all moral issues are relative. We must note, however, this is not an atheist writing about atheism. What he writes is far from how atheists view themselves.
I write about Christianity here and readers comment often that I don’t know anything about it. It is true I have not been a practicing Christian for a long time. But, I hold the view I know more about Christianity than most Christians who write about atheism know about atheism.
What I know about Christianity was written by Christians. What Christians know about atheism is mostly what other Christians have written or said about atheism.
One of the common things Christians say is that atheists have no moral values. I have never heard an atheist say or write this. It is a historical fact that morals are not absolutes, even though Christians say their morals are absolutes. Different societies have different moral standards. One controversial statistic is that atheists are under represented in prisons compared to the size of their population. Christians are over represented
All moral standards come from the societies where the reside. They are the result of human experience not religion. Societies found they could not survive if they often killed each other or took each other’s possessions. These experiences gave us the Ten Commandments.