“...he was telling me that he has heard...”
Hearsay. Unless your son has firsthand facts, it’s hearsay.
Heresy yes, but we both think it’s probably true. His schoolnis wonderful, but it is not perfect. There are lots of kids with lots of money and worried about appearances. Lots of the kids don’t go to church regularly. The teachers, staff, and Christian kids do their best to witness to these kids. At least, they are hearing the word constantly at school.