The conscience clause in the middle of the Catechism does allow for SOME disagreement with church teaching, if done after much effort and labor and discussion and reflection and prayer. One might, for example, disagree with the Church on contraception or divorce or capital punishment under such parameters. There is more gray area in the Catechism than one might think. But, it is clearly impossible to disagree on the matter of taking innocent life, certainly innocent life already 20 weeks old. The Science is clear. And if a baby in the womb is not sacred, nothing is.
That's why all post-concilar catechisms need to be burned.
Looks here like you're defending contraception in certain cases, Mr. Chips. Do you deny it?