'In Sin' in the Bible

Now therefore fear LORD, and serve him in sincerity and in truth. And put away the gods which your fathers served beyond the River, and in Egypt, and serve ye LORD.

And the number of them, with their brothers who were instructed in singing to LORD, even all who were skilful, was two hundred eighty-eight.

Behold, I was brought forth in iniquity, and in sin my mother conceived me.

They answered and said to him, Thou were born entirely in sins, and thou teach us. And they cast him outside.

What will we say then? We continue in sin so that grace may abound?