Marriage between persons of different religions, 

or Interfaith Marriage.

First, we must say that mixed marriages only work successfully if both people agree on and demonstrate mutual respect for the other's religion long before they are married, and continue to do so afterward.

As for kids-- and I'm sure this will be an unpopular viewpoint-- I believe in keeping religion out of children's lives until they are ready to ask questions and make decisions for themselves. I'm specifically referring to attending services, learning about the teachings and beliefs of the two religions. 

Note that a civil marriage, in countries where it exist, is possible between persons of different religions and him even desirable if there are children...

The conditions below concern only those who want, besides, to make celebrate their marriage in the religion of one of the fiancés.

Read more about mixed marriages :

1 Marriage of a catholic with an orthodoxe or protestant. 

2 Marriage of a catholic with a non-baptized person.

3 Marriage between catholic and jew.

4 Marriage between christian et muslim

             An advice from Khaleel Mohammed

          A Turabi Fatwa about marriage of muslim women            

5 Other religions