Islam, Judaism and Christianity.
They are the major religions
Both Islam and Christianity originated out of Judaism.
The connection between Islam, Christianity and Judaism is that the three religions trace their history to the covenant between God and Abraham.
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.
All Christianity - medieval, ancient, modern and otherwise - differs from Judaism and Islam in worshiping Jesus of Nazareth as the Son of God, Lord and Savior.
The Holocaust
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