“A person who is prejudiced in his views and intolerant of the opinions of others” is known as

Such a person is a bigot: someone obstinately attached to his own opinions and intolerant of those who differ. "Orthodox" and "traditional" describe holding established or customary beliefs, which need not involve intolerance of others, and an "ideologue" is a committed adherent of a particular ideology, not necessarily a prejudiced or intolerant one.