Islam is the religious belief of the descendants of Ishmael, son of Abram. Ishmael was born to the pagan Abram, whom GOD called out of Ur of the Chaldeans.
Judaism and Christianity are faiths from the descendants of Isaac, the son of Abraham.
Abram was transformed to Abraham in Genesis 17, which states the following:
When Abram was ninety-nine years old, the Lord appeared to him and said, I am the Almighty God; walk and live habitually before Me and be perfect (blameless, wholehearted, complete).
2 And I will make My covenant (solemn pledge) between Me and you and will multiply you exceedingly.
3 Then Abram fell on his face, and God said to him,
4 As for Me, behold, My covenant (solemn pledge) is with you, and you shall be the father of many nations.
5 Nor shall your name any longer be Abram [high, exalted father]; but your name shall be Abraham [father of a multitude], for I have made you the father of many nations.
6 And I will make you exceedingly fruitful and I will make nations of you, and [a]kings will come from you.
7 And I will establish My covenant between Me and you and your descendants after you throughout their generations for an everlasting, solemn pledge, to be a God to you and to your posterity after you.
8 And I will give to you and to your posterity after you the land in which you are a stranger [going from place to place], all the land of Canaan, for an everlasting possession; and I will be their God.
When Abram’s name was changed to Abraham, Ishmael no longer had ‘bragging rights’ or the rights of the firstborn.
Abraham’s firstborn was Isaac, not Ishmael.
Therefore, there are actually only two Abrahamic based religious belief systems, not three.
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