Actually this is immaterial to the fact that Abraham did not father the religion of Islam. He may have fathered some of those who practice this religion, but he most assuredly did not father a religion based upon pure lies.
If a child of yours came up with a new religion that centered upon worshiping Satan, that would not mean that you fathered that religion.
I never said Abraham fathered the Islam. I said he fathered Ishmael.