To end this debate once and for all, here is St Pius X's direct quote in Italian, in the Catechism he approved for teaching in Italy :
"basta il Battesimo di sangue, cioè il martirio sofferto per Gesù Cristo, oppure il Battesimo di desiderio che é l'amor di carità, desideroso dei mezzi di salute istituiti da Dio."
This is from the original Italian text... Directly approved by St Pius X, who was of italian descent and fluent in italian. And to be absolutely certain his words were not misunderstood, he also wrote :
"Chi, trovandosi senza sua colpa, ossia in buona fede, fuori della Chiesa, avesse ricevuto il Battesimo, o ne avesse il desiderio almeno implicito; cercasse inoltre sinceramente la verità e compisse la volontà di Dio come meglio può; benchè separato dal corpo della Chiesa, sarebbe unito all'anima di lei e quindi in via di salute."
For those of you who don't know : St Pius X wrote this catechism himself, when he was still a bishop ... If anyone dares to claim St Pius X was a modernist... They are anathema and going to hell, I can say with full confidence with the full weight of the Church behind me.