Somebody told me it is a sin to deny BoD because it was taught by the ordinary magisterium, just as it was a sin to err on Assumption or Immaculate Conception even before it was a dogma. She is a follower of the Sanborn group.
If you disagree what would be your reasoning?
See Reply #7 above for why I disagree.
Speaking of Bishop Sanborn ... he rejects the necessity of explicit faith in Our Lord and the Holy Trinity for salvation. But that was taught universally by the Church Fathers as well as by the entire Church for 1500 years. What happened to the OUM for 1500 years?