The last line is not on target…for one thing RCIA varies from place to place…and from presenter to presenter…ones mileage will vary…(and the 5% is a rather far off notion).
The rejection of contraception is not an optional thing…it is not a matter open to opinion.
It is not an optional thing…not a thing for private opinion. As Pope John Paul II noted when asked in 1987 : “What is taught by the Church on contraception is not one of the matters that may be freely disputed by theologians. To teach the contrary is equivalent to leading the conscience of spouses into error”…
Lets say for argument sake that such is not infallible …even then it would still something one is to *assent *to as a Catholic.
(and someone who claims that the practical judgment of their conscience (which would be erroneious) tells them that they would sin here and now if they did not use contraception…need to *correct *their erroneious conscience just as one who thinks it would be a sin to pray needs to. It is by the way not their conscience against the Church…but their conscience divided against itself…for they are Catholics and the teaching of the Church is not some foreign thing to their conscience…)
There are various kinds of assent to be given the various kinds of teaching…but assent is to be given as a Catholic. As the Catechism notes as well as has been explained by the
Congregation for the Doctrine of the Faith…
The CDF noted that there are certain things that are to be given the assent of Faith…other things that are to be given a “firm and definitive assent” based on faith in the Holy Spirit’s assistance etc and there are teachings that require the religious submission of intellect and will…
Also I should note
The Vademecum issued by in 1997 for confessors noted:
"The Church has always taught the intrinsic evil of contraception, that is, of every marital act intentionally rendered unfruitful. This teaching is to be held as definitive and irreformable. Contraception is gravely opposed to marital chastity, it is contrary to the good of the transmission of life (the procreative aspect of matrimony), and to the reciprocal self-giving of the spouses (the unitive aspect of matrimony); it harms true love and denies the sovereign role of God in the transmission of human life (Vademecum for Confessors 2:4)
Jimmy Akin – Catholic Answers senior apologist give the following commentary in 2004:
jimmyakin.org/2004/11/contraception_i.html
And in a note from the CDF in 2010 one interestingly finds regarding the mortal norm concerning contraception this line: “This norm belongs to the tradition of the Church…”