Hi,
According to Islam is a child's religion determined by the religion of
the mother or father ? (an example to clarify - in Judaism it is the
MOTHER's religion that determine's the child's)

Hello - thanks for your question.

In Islam, a child's religion is determined by the father's. 
According to Islamic law, the child of a Muslim father must be raised
as a Muslim.


"Your children have to be raised according to their Muslim father's
religion: Islam."

"The Sharia (Islamic Law) states that in mixed marriages "the children
will follow the better of the two religions of their parents", which [
. . . ] is considered Islam. The Quran states that Islam is the only
true religion, "The religion before Allah is Islam" Surah 3:19."

Islam Review: Being a Muslim's Wife
http://www.islamreview.com/articles/beingamuslimswife.shtml


* * * *


"MIXED MARRIAGES

With few exceptions, a Christian or Jew who marries a Muslim and
resides in an Islamic country will be subject to provisions of Islamic
family law in that country. In these circumstances:

-- Any children born to the wife will be considered Muslim. They will
usually also be considered citizens of the father's country."

ISLAMIC FAMILY LAW
http://travel.state.gov/islamic_family_law.html


* * * *


The children of such a mixed marriage belong to the husband, and must
be raised Muslim (this is why a Muslim woman may not marry a
non-Muslim).
      
"What Does Marriage to a Muslim Involve?"
http://www.gospelcom.net/awm/new/about_islam/q+a/a_marriage.shtml


* * * *


In the Islam religion [ . . ] the children must be raised Muslim.
Under Islam, the Muslim father does not have a choice. [ . . ] I asked
my Muslim love what would happen if we chose to not raise our children
Muslims, he answered, "then I'm not Muslim." That's the bottom line.

Having children with a muslim man
http://www.beliefnet.com/boards/message_list.asp?discussionID=29065


* * * *


"her children are Muslims, following their father's religion"
Inheritance: Children of second marriage & their inheritance
http://www.ourdialogue.com/i4.htm


I hope this is helpful. Please free to ask for clarification if
anything needs further explanation.

Regards - Leli

searches:
Islam "father's religion"
Islam children religion
Islam "mixed marriage"

Well, this comment is not intended to be a guidance to other links on
the web for further research, but mainly a moslem's answer to your
question because I felt by reading the answers that some key elements
are not stressed.
In islam, the parents (be it father or mother*)have the religious
obligation to raise their children with the islamic faith, but this
does not imply that you are a moslem by inheritance. Each individual,
once reaching adulthood, has the obligation (morally and before God)
to be intimately convinced (and hence seek conviction)of his/her
islamic faith.
In a nutshell, claimming to be a moslem just because your parents are,
is not enough before God. You must be convinced with your faith.


If you want further details, please tell me and I will do further
research.

*: That's one of the reasons wemen in islam can't marry non moslems -
Though I am not really sure if that's the opinion of the majority of
scholars-. Because it would make it very hard for her to follow her
moral convictions, and raise her kids according to her faith, if her
husband objects to this.