I'm a royalist and support the monarcy here in Sweden, so yes I would, of course.
I would support this, William would be a better king.
If Charles converted that would only make him lose his claim to the throne, children of catholics can still inherit the British throne, as long as they were raised protestant.
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Yes and no. You are correct that I was mistaken as to the effect Charles' conversion would have on William and Harry as they would still be in line for the throne, but for children of Roman Catholics, it would depend on when the parent converted or marries a Roman, not whether they were raised Protestant.
Say for example that Princess Beatrice of York marries a Protestant, has a child, converts to being a Catholic and has a second child. Even if both children are raised Protestant and are never professing Catholics, while the first child would be in the order of succession, the second would not, for under the Bill of Rights, 1689, for purposes of the succession, Beatrice would considered to be dead as of the moment of her conversion, and dead people can't generate heirs.