Many have promoted the idea that daniel had a righteous enviorenment before he was taken into captivity!
But the opposite seems to be the case the evil of the was cause of the exile. Surely he had some spiritual training to draw on and thru hardship developed a relationship with God that God honored. Calling him out from a place of idols, prostitution, and detestable practices; much the way God called Abramham before him. God is able to call anyone to Himself no matter their training or upbringing thus shall be His children of choice.