Where do you think the line is between practicing your own religion faithfully and unethically forcing your beliefs on someone else?
That's not just someone that's a child, their child. So, the question should be: where do you think a parent should stop being a parent who has authority over their child? And where a child stop being a child (someone being taken care of and who is subject to the authority of their parents) to become a person (someone responsible for themselves).
Parents are responsible for their kids up until the child is reaching the 'age of reason' (sorry, not sure how to say that in English: when the is (legally) able to live and decide by themselves). How would anyone be able to raise (be responsible for) a child and make decision without pushing their own values on the kid? I mean, for me it's almost impossible. You can give options, a lot of options, but there will still be limits. Heck, even the simplest 'eat your veggies', 'brush your teeth', or 'you must do your homework before you can play your video game' (or their exact opposites, aka 'do whatever you want, I don't care about you') is already telling a lot about what values the parents are pushing onto their children.
My parents raised me as the atheists they were. That too is an ethical/philosophical/moral personal choice they pushed onto me without me being able to object anything, right? They never asked me if I was an atheist, or not.
The funny thing is that them being hardcore atheists did not prevent them to tweak the system so I could be send to a private catholic school because my father knew it was the best school. Another (unethical?) choice of them on which I had little to say as a child. And to be frank with you, now aged 50+ this is probably the second of only two reasons I feel gratitude towards my parents (the first one being that I had a roof and I was fed up until I was able to leave): the teaching there was demanding but it was also amazingly good.
Like mentioned already I would say: it's the parent's call. Because if christian or whatever else parents should not be allowed to share their faith with their own child, then logic mandates that no parent at all should be allowed to share no personal value at all with their child. Then, no parent should be allowed to raise their own child.
That may not be bad, though: Plato considered the idea in his Republic, suggesting kids should not be raised by parents but by city (the Ancient Greek ancestor of our modern States and Nations) operated and controlled institutions. But then, the question instantly becomes: who will decide what this city/state/nation controlled education should be about?
Real great question, with no simple answer I'm afraid.
Another money-grab business? Just asking.