Abraham

From WikiIslam

According to Islam, Abraham was a patriarch of both the Jews and the Arabs, and an ancient prophet of "pure" monotheism also known as a Hanif. (Neither the Jews nor the Christians believe Abraham was a prophet.) Although it is not specified in the Quran or Hadith, most Muslims believe it was his son Ishmael who he attempted to sacrifice to Allah. Qur'an 2:125-127 places the two of them in Arabia where they rebuilt the Ka'aba.

There is no archaeological or historical evidence to prove these Islamic claims. The oldest stories about Abraham (found in the Torah) place Isaac on the sacrificial altar, not Ishmael. Also there is no reason to believe that Abraham and Ishmael ever set foot in Mecca let alone rebuilt the Ka'aba.

For more information about Abraham and a comparison of his stories according to the Judeo-Christian beliefs vs. the Islamic ones, please see Wikipedia's article.