Judaism was fist, about 6,000 years ago, followed by Christianity, 2,000 years, and then Islam 1,400 years ago. They all have faith in one God (monotheism.) Judaism existed until a sect of Jews split from the mainstream, claiming Jesus Christ was their Messiah, forming Christianity. Islam was formed by Middle East Arabs, not Jews though, because they believed the Bible and the Torah was corrupt and the Koran was sent as God's final message.