[bdeaner]

According to the Catechism there can be no question; the debate is over.

Correct. Ex Cathedra teachings are not up for debate among Catholics. They are considered infallible, and their rejection is heresy, the result of which is excommunication.

Protestants similarly hold that canonized Scripture is infallible and that their rejection is not up for debate. The Catholic Church simply has an expanded conception of the Word which includes inspired, ex cathedra teachings of the Magisterium--teachings which cannot and never have contradicted Scripture -- which is not to say that there are not alternative interpretations, but such alternatives are considered heretical. Note, however, that Church teachings do not add to Scripture; they are teachings on the Scriptures.

[PugetSoundSoldier]

Note, however, that Church teachings do not add to Scripture; they are teachings on the Scriptures.

Then what is the scriptural basis for the sinless nature of Mary and the denial of the brothers and sisters of Jesus? These infallible positions would be in addition to the scriptures, if there isn't a scriptural basis for them, correct?