Well finally, the Vatican actually speaks up! There is hope :-)
My oldest daughter is married to a man who's family is from India. Technically they're Hindu. His parents built their own shrine in their home because of all the chatter going on at temple services. Sound familiar? This guy is the best son in law any mother could ask for. When I was sick last year, he came over and cleaned my kitchen. My son has severe hayfever, so my SIL comes over and mows the grass.
He treats my daughter wonderfully. She goes to church, and I think he goes with her. There are benign Hindu customs that they practice on occasion. It makes his mom happy ;-)
My friend is Jewish. We share the same political beliefs, and plan on going over the old testament together. Actually he's reform, but goes to an evangelical Christian church. Religious differences are a big problem when young people marry, mainly because of the kids. We're in our 40's so that isn't a problem. I don't see a problem for my daughter and son in law regarding this, either.
Now that I've covered secular Jews and Hindus, Islam is a completely different kettle of fish. Several people have remarked that Islam is a Satanic cult. I'm starting to think there is some truth to that. Islam is dangerous for any woman, not just Catholic women. The problem for some of us is that we're optimistic and credulous when we fall in "love". The last few years hopefully will wake up the younger generation of women to the dangers of such a marriage.