All 3 religions had a common origin. If you went back far enough, all 3 were the same religion.
Islam, Judaism and Christianity.
Which one of the following elements is common to Judaism, Christianity, Islam, and Zoroastrianis
The common ancestor of the three religions Judaism, Christianity and Islam was Abraham
Abraham.
Both Islam and Christianity originated out of Judaism.
It is called (the set of) Judeo-Christian values. Christianity is a daughter-religion of Judaism.
Christianity and Judaism
they are all Monotheistic Religions.
Christianity is based on the teachings of Jesus Christ, but obviously has a great deal in common with the the moral precepts of Judaism.
Judaism and Christianity have the bulk of the old testament in common. However Islam draws some of its source material from biblical stories but re-interprets it, so it does not have anything in common in terms of the bible.
Some of the most common beliefs are Christianity, Muslim, Judaism, Hindu, and Atheism.
The Pope has called Judaism "Christianity's older sister," since Christianity bases much of its content on Judaism.