Dear Brothers Michael and Peter:
I recently came across an article… [which] stated that Pope St. Pius X in his catechism was asked if the absence of Baptism could be supplied in any other way and the answer was in fact in favor of baptism of desire. I was just confused on this and was wondering what you had to say about it.
17 Q: Can the absence of Baptism be supplied in any other way?
A: The absence of Baptism can be supplied by martyrdom, which is called Baptism of Blood, or by an act of perfect love of God, or of contrition, along with the desire, at least implicit, of Baptism, and this is called Baptism of Desire.
Melissa, thank you for your question. This is addressed in our book Outside the Catholic Church There is Absolutely No Salvation, which has a section on the Catechism of Pius X, which we will include below (it's short). The simple answer is that the Catechism which people attribute to Pius X is not infallible and actually contains heresy (as shown below) – it teaches salvation “outside” the Church – and it wasn't written by St. Pius X. Furthermore, the infallible Council of Trent (also quoted below) teaches (without any exceptions given) that the Sacrament of Baptism is necessary for salvation, which means that it cannot be supplied.