well they are. If anyone on here knows anything about the Koran - and 99% of Christians certainly don't even though they act like NASA experts on it : Judaism, Christianity, Islam all have the same root: Abraham. Muslims regard all Judaism and Christianity as evolutions of the word of God which is finally distilled into the final truth by God via Mohammed. Christ is revered as , not the son of God, but like Moses- as a prophet- to be revered and respected at all times.
Sadly history, mans greed and politics have screwed up that relationship well and truly to fubar levels.