The monotheistic religions are called Abrahamic religions. So Judaism, Christianity and Islam(this is the order of appearence) have the same root into Abraham. There are some splits into smaller religions, but all see Abraham or Ibrahim as one of the key persons and all believe in one god, so they are monotheistic.
The monotheistic religions are called Abrahamic religions. So Judaism, Christianity and Islam(this is the order of appearence) have the same root into Abraham. There are some splits into smaller religions, but all see Abraham or Ibrahim as one of the key persons and all believe in one god, so they are monotheistic.