Marriage is much easier when both people are of the same faith. Rearing children is one of the first problems that crops up in mixed faith households. Who's church will they go to? How will they be raised? These questions can potentially cause a lot of problems between a husband and wife. The only mixed faith relationships that I've seen that have worked exceedingly well (this is in my limited experience) are the ones where both parties either stopped going to church altogther, or one person joined their spouse's church.
Sure there are exceptions. And Love should be enough for anyone. But in the real world, love is often not enough for some people.
Also, to be noted, many churches frown on interfaith marriages. Some because of the strife that it introduces in the relationship and some because of the very nature of the family unit itself. In my own church we are merely recommended to seek out a same faith spouse.
you also have to consider that some faiths doesn't require churches at all. Take Buddhists or even some other Asian religions....they have temples, but not actual churches. The temples are more for going to pray to a god(s) or goddess(es) WHEN you FEEL like you NEED to.
As opposites to a church where you HAVE to go to during certain days, like Sundays, in order to listen to sermons, Or else.
So people who was of two different faiths that did not have churches, would have no problems over children needing to go to a place of worship... since such praying, worshiping are usually done at home.
Also, rearing children are nearly alike in ALL religions and beliefs on a very basic level.Take my examples:
A christain parent tells his/her child that it's wrong to lie, cheat, or hurt others.
A Buddhist parent tells his/her child that it's wrong to lie,cheat, or hurt others.
A pagan parent tells his/her child that it's wrong to lie,cheat, or hurt others.
Even a Atheist parent tells tells his/her child that it's wrong to lie,cheat, or hurt others.
So you see, regardless of the religion, Most parents try to raise their children to be decent people who does not lie much, cheat, hurt others or other immoral acts.
And at a basic level, nearly all religions actually AGREE on what's wrong in terms of how to treat your fellow man!
And that aside... IT IS POSSIBLE TO RAISE A CHILDREN TO BE GOOD PEOPLE WITHOUT NEEDING RELIGION BROUGHT INTO IT UNTIL THEY'RE OLD ENOUGH TO START CHOOSING THEIR RELIGION WITH A FULLY INFORMED MIND.
Most families who are of mixed faith often agrees that they will simply raise their children by the societial moral codes (the whole "it's wrong to lie, cheat, and hurt others" thing) instead of competely force-feeding their children their religous beliefs before they're old enough to really apperciate the idea of needing a religion.
Don't get offended here...But I always felt that it was wrong to make children go to church and to keep on feeding them religious information their whole lives.
Why? Because in essence you are making them believe in something when they are TOO YOUNG TO UNDERSTAND WHY THEY SHOULD BELIEVE. And then they grow up to be UNBELIEVERS PRETENDING TO BE BELIEVERS.
Let me explain. They simply only mimic their parents' actions, their words and such,but it's all empty words without much meaning.
They don't TRULY believe because they NEVER got into opening their hearts and mind to god ON THEIR OWN. true believers are supposed to come to god on their own, rather than forced/pushed into it.