I would like to add something to this thread.
I’m a convert to Catholicism. During the process of catecheses, I was asked to profess the Nicean Creed, believe in the Sacraments, and Catholic teachings on Mary. These things I believe. Nor was I asked to believe everything that was written in the Catechism. I was told belief in the things mentioned above are enough to become Catholic, and call oneself Catholic. When children in my part of the world are prepared for Confirmation, they are not asked to profess belief in mongoenism. Monogenism was never mentioned. I was never at any time told belief in monogenism was essential, and all the books I read stating what teachings are essential, that must be believed in order to become Catholic, mongenism was not among them. If belief in monogenism is essential, I have to ask myself why not? I was never told I could not become Catholic unless I believed in mongenism.
Now some may say I was ‘badly catechized’ and I should have been told belief in monogenism is essential, and I should have been told I had to accept everything in the Catechism in order to become Catholic. They may have a point, but nothing will change the fact that when I became Catholic I didn’t ‘sign up’ to belief in monogenism, and I wasn’t asked to. The first time I heard it this teaching was binding on Catholics was about six months ago on this forum, which seems a bit late in the day to me.