I’ve never encountered any problem presenting the Church’s teaching on abortion to 8th graders. They completely understand and agree that killing babies is always wrong.
Even in the one case where one of my 8th graders said they’d learned abortion was “just a choice” in school, I simply asked “so what is it that the woman is *choosing *to do?” After 30 seconds of thinking about it, the horrified look appeared.
It is adults who are the problem. Children are horrified by the idea that mothers kill their babies.
I simply present the truth about the sanctity of life, the 5th commandment, and that we must continue to fight for the rights of the unborn.
I would not call it the “Catholic Church’s position on abortion”. That makes it sound like there are other legitimate positions. I would call it the truth about the dignity of the the human person, including the unborn.