Oh, dear. That sounds very bad. I hope the traditional Catholics can hang on. Are there enough left that his making them mad might cause him to be defeated for re-election?
Actually, many Catholics in Spain are pretty traditional. They're not "traditionalists" in the US sense, but simply have hung on to a fairly sound faith. The fact that the Spanish translation of the Mass was an actual translation helped, and the gradual replacement of some of their more politicized and liberal bishops over the last 15 years or so has helped a lot, too.
That said, while the number of practicing Catholics in Spain is higher than, say, Italy, it is a lot lower than it used to be and I'm not sure the Church would have an enormous amount of clout, although it will have some.
Today's good news: Zapatero was booed by the crowd in Valencia! They started booing when they saw him, kept it up while he was in the Episcopal Palace meeting with the Pope, and booed him when he came out again. Way to go!