Question

How did isma'il rule affect the religion of islam

Answer 1

After the death of Muhammad ibn Isma'il in the 8th century CE, the teachings of Ismailism further transformed into the belief system as it is known today, with an explicit concentration on the deeper, esoteric meaning (batin) of the Islamic religion.

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Answer 2

Because of this, Isma-il put anyone to death who didn't convert to Shi'ism. He also destroyed the Sunni population of Baghdad. Then, Selim the Grim killed all the Shi'a in the empire.