The holy sites of all three religions can be found in the Middle East, where all originated. More specifically, all have sites located within the current nation of Israel.
Palestine
Islam, Judaism and Christianity.
Judaism, Christianity, and Islam have all claimed the Holy Land for themselves.
Judaism, Christianity, and Islam religions.
For Judaism and Christianity it is Jerusalem. For Islam it is Mecca.
-- Islam -- Judaism -- Christianity
Christianity and Judaism
Judaism, Christianity and Islam.( Abrahamic religions)
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.
Islam stems from Judaism, Christianity, Arab Henotheistic religions, and small bits of Zoroastrianism.
Christianity and Islam both trace their roots to Judaism.