According to Google, bigotry is:
obstinate or unreasonable attachment to a belief, opinion, or faction, in particular prejudice against a person or people on the basis of their membership of a particular group. "the difficulties of combating prejudice and bigotry"
While, still according to Google, bigotto means:
Chi assiduamente e scrupolosamente osserva le pratiche del culto senza afferrarne l'intima essenza religiosa; bacchettone, pinzochero.
It seems like in italian the meaning is strictly related to religion, while in english it has a "wider" meaning.