Today is Hari Raya Haji, otherwise known as the “Festival of Sacrifice”.
Celebrated by Muslims worldwide, it honours the willingness of Ibrahim to sacrifice his son Ishmael (Ismail) as an act of submission to God's command. God then intervened to provide Abraham with a lamb to sacrifice instead.
The same story is told in the Old Testament, God had called Abraham to embark on a three day journey (Genesis 22) to Mount Moriah to sacrifice his son Issac.
There are several similarities between the bible and the koran. Perhaps if we're willing to believe that there is only one God and that we each honour Him in different ways, we can live side by side in harmony.