I do not understand what that means with respect to the Catholic Church in Ireland, just Ireland? ( I should say that for all his reported brilliance, I always want to scream WHAT IS YOUR POINT? every time I read anything Rowan Williams says. Bring on Benedict XVI, totally clear and easy to understand.)
For one thing the Catholic Church is not about geographic boundaries. That's an English thing.
The ABC needs to read the CTS booklet on Heresy through the Ages. Penned by a classicist, I'd say, because it has that crystal clear, straight to the point, QED style, it quickly gets you through all the big no-nos.
One of the no-nos is saying that sacraments are invalid because the Priest is guilty of immoral behaviour.
That's all there is as far as I'm concerned.
Does the Catholic Church have teaching authority? Yes
Are the sacraments true? Yes
Do individual Catholics do very very wrong things? Yes, sadly.
And it will, alas, always be so.