Anothony's fear of his family's sins leading to hell is shown in his dreams. Watching his brother's sin lead him to hell.
Anthony's mother poured the belief of the Virgin Mary's grace and love. But in the dream, it also shows the fear and reality of Tony's heart that not only is his family sinners but he is too.
The Golden Calf was just mentioned as Tony's idol. God reputed Tony for having other God. The God being the golden calf and now his judgment falls on the people when their hearts turn cold and kill his beloved Ultima the eat of the calves in the lake. This story was shared with Tony now haunting his nightmares.