In Pastor Tim Keller’s The Reason for God, 2008, he quotes one of many former athiests: Christians have a “higher standard” following Jesus, than she thought she had by being a moral person.
“Do not conform yourselves to the standards of this world, but let God transform you inwardly by a complete change of your mind. Then you will be able to know the will of God – what is good and is pleasing to him and is perfect.” Romans 12:2 (Good News Translation w/ Apocrypha GNTA)