Teacher said a heresy

So I’m in 8th grade and I have a WV studies (West Virginia studies is what WV 8th graders have for social studies) Teacher who I adore and he is truly a lovely guy and an excellent teacher. Since the beginning of this school year we very often talked about Christianity. He is a Lutheran, but there isn’t a Lutheran church in the area so he goes to a Presbyterian church. And he is also much much much more educated on the Christian faith then I even though I consider myself to be quite educated. We were talking a few days ago and we were debating what Matthew 16:18 said he always says that Christ was talking about Peter’s realization that he was the son of the living god and not Peter himself. This is already ridiculous but here comes the worst part. I told him “ the Catholic Church was the church created by Christ himself” he says in response “no the Catholic Church was created at the council of Trent when they denied the “truth” “ so I just shook my head know because at the time I didn’t have a good argument and we continued our debates. A few days later I told him “ Mr Teacher (his name) I love you and you are truly a wonderful person, but that is the most idiotic, fantastical, ridiculous, heretical thing I’ve ever head” (this is after I had brought it back up to him) and from there I don’t remember much else. So yeah. I just wanted some advice on this thanks