One reason why The Imamate is important to Shi’a Muslims is that the imams are exemplary Muslims who teach and interpret the Qur’an without fault, preserving the Qur’an.
A second reason why The Imamate is important to Shi’a Muslims is that the imams were just rulers, demonstrating Allah’s teachings on fairness and equality.
The belief in predestination influences a Muslims life as they will understand that Allah has them on the right path – so everything must happen for a reason.
Allah communicates with humankind through three ways according to Sunni Muslims: through the Holy Qur’an, through the Holy Prophet, and through the Holy Angels.