I don’t think this is a good idea. I think if you’re a catholic you just have to accept that your child will not sit on the throne of england, not at this time. Or Jewish or any other religion (besides c of e, obviously).
In fact, I think that stupid Prince Charles should just have renounced the throne and gone off with Camila, but of course, then we wouldn’t have had Prince William and he seems to be a right guy. And that Kate Middleton is really something. She may not be Catholic, but the woman must be a saint, to let her sister look that good as her maid of honor.
Except that isn't how it works. There is no clear law to prevent a Jew or a Moslem or a Wiccan (or any other religion) or a Lutheran or a Methodist (or any other Christian denomination) from being King or Queen of the United Kingdom. The law only excludes Catholics and those married to Catholics. Yes, it would be awkward given the Monarch's position of Supreme Governor of the Church of England if they were not a member of the Church of England, but the law does not require that - it simply excludes Catholics and only Catholics.
When the law was made, there were actually reasons for it - conflict between Catholics and Church of England were causing civil wars, revolutions, etc, and it was still the official position of the Catholic Church that the Monarchy of England should be overthrown - but those conflicts gradually ended.
In fact, I think that stupid Prince Charles should just have renounced the throne and gone off with Camilla
He couldn't - there's no power in British law that allows somebody to renounce a claim to the throne. A person can abdicate once they become King or Queen, but they cannot renounce a claim in advance.
From personal experience, the Prince of Wales is far from stupid but he also has a strong sense of duty to hos country - which is why he did not propose marriage to Camilla back in the 1970s - because at that time, he was told that that was not compatible with doing his duty to his country.
I think the condition is only against the monarch being Catholic. No issue with a Jewish one :-)