Not that I'm an expert in religion, but from what I know, all 3 religions are Abrahamic religions (meaning they all believe in Abraham) and have many similarities, so they all believe in the same God. As previously pointed out, the Torah is the same as the old testament in the Bible. Many of the stories in the old testament are believed by all 3 religions such as the stories of Adam and Eve, Moses and Noah. There are probably more stories they have in common that I'm not aware of. The new testament is for Christians only. Jesus was Jewish (so Jews acknowledge his existence). Christians believe that Jesus is the son of God. Muslims believe that Jesus is a prophet (he is mentioned in the Koran) like Mohammed, but not the son of God. A colleague of mine was doing research on this for her Master's degree. I know people that are Jewish and Muslim who have confirmed what I just mentioned. We have more in common than most people realize because religious zealots, politicians and politics in general have demonized other religions to further their own agendas (all religions are guilty of this). A quick Google search of the facts I have mentioned will confirm this.