In fact, Trent explicitly condemned it as heretical to say that the Sacrament justifies even if the individual does not have the proper dispositions

One day Genesius, leader of a theatrical troupe in Rome, was performing before the Roman Emperor Diocletian. Intending to expose Christian religious rites to ridicule by his audience, he pretended to receive the Sacrament of Baptism.^[2]

As the play continued, however, Genesius suddenly while performing had a conversion experience on stage. He announced his new faith, and refused to renounce it, even when ordered to do so by emperor Diocletian.^[3] Genesius persisted in his faith, and he was finally ordered to be beheaded.

Note 1. The baptism which he received on the stage was no more than a representation of that sacrament, for want of a serious intention of performing the Christian rite; but St. Genesius was baptized in desire, with true contrition, and also in his own blood.