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Here is my most concise answer on Fr. Feeney: Fr. Feeney taught that, although one could theoretically be justified by BOD, nevertheless, that person STILL does not have what is required to go to heaven: The sacramental character of baptism.

Ordinarily They Are Not Baptised At Once
On adults, however, the Church has not been accustomed to confer the Sacrament of Baptism at once, but has ordained that it be deferred for a certain time. The delay is not attended with the same danger as in the case of infants, which we have already mentioned; should any unforeseen accident make it impossible for adults to be washed in the salutary waters, their intention and determination to receive Baptism and their repentance for past sins, will avail them to grace and righteousness.

Nay, this delay seems to be attended with some advantages. And first, since the Church must take particular care that none approach this Sacrament through hypocrisy and dissimulation, the intentions of such as seek Baptism, are better examined and ascertained. Hence it is that we read in the decrees of ancient Councils that Jєωιѕн converts to the Catholic faith, before admission to Baptism, should spend some months in the ranks of the catechumens.

Furthermore, the candidate for Baptism is thus better instructed in the doctrine of the faith which he is to profess, and in the practices of the Christian life. Finally, when Baptism is administered to adults with solemn ceremonies on the appointed days of Easter and Pentecost only greater religious reverence is shown to the Sacrament.

Why is it an act of heresy? Does not Our Lord Himself command that without water there is no salvation? Further, no one is bound to believe in BOD as it is not a dogma, as regards baptism, only Sacramental Baptism is binding.

At any rate, there is no "unforeseen accident" to God.

Quote from: LordPhan

Quote from: Stubborn

Why is it an act of heresy? Does not Our Lord Himself command that without water there is no salvation? Further, no one is bound to believe in BOD as it is not a dogma, as regards baptism, only Sacramental Baptism is binding.

At any rate, there is no "unforeseen accident" to God.

It is a Dogma, Extraordinary Magisterium which you are asking for, is defined Dogma. ordinary Magisterium, which BOD and BOB pertain are Dogma's undefined but still required assent.

One of the marks of a Dogma is that it's meaning does not change and we are bound to believe it because it was always a part of the Deposit of Faith.

BOD has dozens if not hundreds of different meanings, theological opinions and applications - the one thing they all seem to revolve around is the "unforeseen accident" or the "death bed conversion" -  and though it has been taught but because there are so many different meanings, it is not a dogma, certainly not defined, and no one is bound to believe it. As such, one who chooses not to believe in BOD is not guilty of any heresy - obviously the same cannot be said of  Sacramental Baptism.