The following article contains an answer for the question: What is the name of the character whose belief in Judaism is restored by a rendition of "Walk Hard"? , can you please find it? 

In Springberry, Alabama, 1946, young Dewey Cox accidentally cuts his brother Nate in half with a machete. The trauma causes Dewey to lose his sense of smell. Dewey meets a blues guitarist, who discovers Dewey is a natural musician.
In 1953, after a successful talent show performance, 14-year-old Dewey leaves Springberry with his 12-year-old girlfriend Edith; they soon marry and have a baby. Working at an all-African American nightclub, Dewey replaces singer Bobby Shad onstage and impresses Hasidic Jewish record executive L'Chaim.
While recording a rockabilly rendition of "That's Amore," Dewey is berated by an executive. A desperate Dewey performs "Walk Hard," a song inspired by a speech he gave Edith, which restores the executive's belief in Judaism and rockets Dewey to superstardom.
The song becomes a hit within 35 minutes, and Dewey becomes caught up in the rock-and-roll lifestyle. Dewey is introduced to marijuana by his drummer Sam, and becomes unfaithful to Edith. Dewey's father informs him that his mother has died while dancing to Dewey's song, and blames Dewey's music for her death. Distraught, Dewey finds Sam using cocaine and partakes, resulting in a cocaine-fueled punk rock performance. Choirgirl Darlene Madison enters Dewey's life, and he produces several hit records amid their courtship laden with sexual tension. He weds Darlene while still married to Edith, which leads to both women leaving him, and purchases drugs from an undercover cop. After he serves time in prison and in rehab, Darlene returns.

L'Chaim