They are linked through holy books and prophets. They believe in Almighty God, prophets, angels, heaven and hell, life after death, day of judgement.
Judaism, Christianity, and Islam are all monotheistic religions, meaning that they believe in only one god, rather than multiple gods. More specifically, they believe in the God of Abraham.
They're similar in the fact that they have one god (Allah in Islam, Yahweh in Christianity.)
Islam, Judaism and Christianity.
Christianity, Islam, Judaism & even Baha'i all have a mutual ancestor: Abraham.
Judaism Christianity and Islam all are...Monotheistic Religions.
Judaism, Christianity, and Islam have all claimed the Holy Land for themselves.
Judaism, Christianity, Sikhism, Zoroastrianism, & Baha'i.
Judaism, Christianity, and Islam religions.
For Judaism and Christianity it is Jerusalem. For Islam it is Mecca.
-- Islam -- Judaism -- Christianity
Christianity and Judaism
Abraham is considered the father of Judaism, Christianity and Islam as the Old Testament's 5 books of Moses - The Pentateuch (books are: Genesis, Exodus, Leviticus, Numeri and Deuteronomy) are included in the Holy Book of Judaism that is Torah. Eventually he is considered as the father of Islam basically claims entire religions of Judaism and Christianity as "prophets" and predecessors of Islam.
The question should be " What does Christianity have to do with Jews (or Judaism)?" Judaism is like a tree where Christianity is its branch and Islam is it leaves. Christianity is based on Judaism and Islam is based on Christianity. The major difference between the three is that Judaism doesn't have jesus in it unlike Christianity and Islam.