Morality for a religious person is closely related to a God, gods, or a higher force beyond him. The concept of Sin that is used by a religious person is also related directly to morality. Sin is disobeying God. Disobeying God is immoral. Sin is immoral.
Sin produces a sense of guilt.
Guilt not Love is the fundamental emotion that religion induces. Obedience to God's rules becomes paramount. Disobeying God's rules is sin, and produces guilt. Similarly God's representative. Otherwise persuasion to believe is necessary.