Listen to sermon Therefore, I urge you, brothers and sisters, in view of God’s mercy, to offer your bodies as a living sacrifice, holy and pleasing to God—this is your true and proper worship. Do not conform to the pattern of this world, but be transformed by the renewing of your mind. Then you will be able to test and approve what God’s will is—his good, pleasing and perfect will. (Rom 12:1-2)
The opposite of Christianity is not atheism. It is idolatry. That means everyone worship someone or something - all the time. So who or to what do you pay homage to? What or to whom are you are willing to lay yourself on the altar for - to have you, to take you, to possess you? What or to whom are you a "slave" to? Whatever or whomever that is will profoundly shape one's being. All to say, transformation doesn't begin with behavioral modification. It begins with worship modification. ~ Ed