There are certain sects, such as Jews for Jesus, which attempt to combine beliefs of the two religions.
Judaism is very much not a part of Chritianity, other than being the religion, some of the members of which, through Jesus, started the movement that later became Christianity.
Answer 2It is true that Jesus is Jewish and that He was sent to the Jews but it doesn't mean that Judaism is part of Christianity. It may be said that Christianity is a continuation of Judaism.Qur'an says (meaning English translation):
"And We (Allah or God the Creator) sent, following in their footsteps (the Jews), Jesus, the son of Mary, confirming that which came before him in the Torah; and We gave him the Gospel, in which was guidance and light and confirming that which preceded it of the Torah as guidance and instruction for the righteous" (5:46)
and says:
"And [mention] when Jesus, the son of Mary, said, "O children of Israel, indeed I am the messenger of Allah to you confirming what came before me of the Torah and bringing good tidings of a messenger to come after me, whose name is Ahmad." But when he came to them with clear evidences, they said, "This is obvious magic."(61:6)
and says:
"And when Jesus brought clear proofs, he said, "I have come to you (the Jews) with wisdom and to make clear to you (the Jews) some of that over which you differ, so fear Allah (or God the Creator) and obey me (Jesus)." (43:63)
A religion that worships one god is called a monotheistic religion, or is described as being monotheistic. In the modern word this would include Judaism, Christianity and Islam. Names for the specific god are diverse.
Christianity and Judaism
Islam, Judaism and Christianity.
The Pope has called Judaism "Christianity's older sister," since Christianity bases much of its content on Judaism.
Christianity does not struggle with Judaism.
Judaism, Christianity, and Islam have all claimed the Holy Land for themselves.
Islam. It claims that it is the continuEation of Judaism and CHRISTIANITY
There is only One God in Christianity, Judaism and Islam.
Judaism & Christianity started with God's Covenant with 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.
Judaism
Both Christianity & Islam are based on Judaism, especially Christianity.