How do Christianity, Hebraism and Islam consider a marriage between people from different congregations?

A_Rm: How do Christianity, Hebraism and Islam consider a marriage between people from different congregations?
First of all, sorry for my poor English (I’m Italian).

Is it a problem if, i.e., an Oxthodox Jew marry a Reform or a Conservative Jew? Or a Shia Muslim marries a Sunni Islam?
I know something about different congregations inside Christianity (it’s a little problem, but it’s not impossible), but I heard nothing about other monotheistic religions.

Answers and Views:

Answer by Battle Girl! Kirsty
God hates

Answer by danieladamwillis
A Christian should marry a Christian.

Answer by TheNoob
Well it’s alright really. Originally Christians, Jews and Muslims can even intermarry between each other.

Answer by Melkha
It would depend on the people involved and the individual congregation, Orthodox usually do not marry Reform, but there have many exceptions

Answer by Ambivalent LAUreate
In Judaism, the issue is not which movement in Judaism the person is a member of, but their standing under Orthodox Jewish law. There are many people who were born to Orthodox Jewish mothers and who therefore are seen by the Orthodox as fully Jewish who nonetheless are members of a Reform community. Then there is no problem. The problems arise ONLY for Reform converts and their descendants, who are not regarded by the Orthodox as being Jewish and therefore not eligible for marriage to an Orthodox Jew.

This is going to be more important if it is an Orthodox Jewish man marrying a woman who is not Jewish according to Orthodox Jewish law, since this would mean her children would not be eligible as Orthodox Jews without conversion. It is not so impossible if an Orthodox Jewish woman marries a man whose Jewishness is questioned by the Orthodox.