Bertrand
I don't understand why you wouldn't want your children exposed to other religions. To understand that not everyone believes the same as them. Frankly, I'm not sure how you would manage it, once they are older than about 4!
As I said above, my kids are (Obviously) exposed to all kinds of people, neighbours, out of school activities, they are youtube and TV watchers. We don't live in the south East, so our catholic school has about 40% catholic pupils.
But I think where we started was that I was complaining that I had chosen a Catholic school for a Catholic education and yet they weren't getting that, they were being taught different philosophies.
Now I believe in my faith. I know it to be truth.
(It's not, people will say, it's one belief amongst many, it's not proven, it's an horrific idea etc)
To me I know it is true. (Others think differently, I know that)
Why would I teach my child something that I don't think is true, is true?
Why would you teach yours? Or anyone teach theirs?
Yes, my kids know other people think it's not true, they know other religions exist.
I suppose I want them to have a safe space. Where they can learn about life and faith and belief whilst they are young.
As they grow they will encounter more and more different ideas, and they will be older, old enough to understand the subtleties, they'll have a good knowledge of what catholicism teaches, so they can choose to go against what I have taught them, but they'll know that they are choosing it, and be secure enough in themselves to make conscious choices.
(As opposed to having a whole raft of competing ideas flying around, and no peg to hang them on. No measure to measure them against.)