I have a very strong moral background, given to me by my parents, and arising from the common morality of this society.Ummm, that won't work. Some societies embrace murder. Societies don't define morality.
For me, murder is absolutely morally wrong. It matters a great deal.
Why?
"Ummm, that won't work. Some societies embrace murder. Societies don't define morality. "
Of course they do. Even when religion comes into question, it was invented by societies. I do not live in a society which embraces murder. I am a product of my own society. Further murder is logically wrong.
You mistakenly believe that morality proceeds only from religion. It does not. All things moralproceed from society. Religion also proceeds from society. This is why each society, historically, invents a religion for itself.
Were there a single deity in existence, we would have a single religion. We patently do not, even today. Looking back in history, we have as many religions as we have had societies.
Morality proceeds solely from society.