A bit over a month ago, a message appeared on s.c.j from a child of mixed parentage. She was my only Zady. I don't agree with him. I never remember seeing my mother's parents either. There have been may responses to my response.
Protestants uphold the same.
The priest may refuse communion. And they definately won't approve. I would never ever teach my children to worship a different God. And if you would want to raise your children in a religion, I would hope you choose the same. You can not teach a child multiple religions at once - you will only confuse the child with contradictory messages and end up with a real problem later on.