What rule is at the core of the Islamic religion? A.
One must believe that Muhammad was a god
B.
One must believe there is one god, Allah, and Muhammad is his prophet
C.
One must beleive that Jesus and Abraham were not prophets
D.
One must serve in the military

It would be B

Explanation:

B.  One must believe there is one god, Allah, and Muhammad is his prophet

Explanation:

Why it is not A. Muhammad was a prophet, and therefore was not a god.

Why it is not C. They actually believed in Jesus and Abraham, but that they lumped them all as prophets. Jesus, who is believed to be the son of God in Christianity, was still put as at most a well-known prophet.

Why it is not D. While the Islamic Religion can be seen as extremely war like, they are not able to set mandatory military service. Therefore, it was not asked for each individual in the Islamic religion to have to take part in the military.

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answer; ///the correct answer is,by introducing a merit system of nobility.