The same St. Peter in the same book contradicts you magnificently.

For when the Prince of the Apostles was proclaiming the Gospel, it is recorded by St. Luke,

[43]To him all the prophets give testimony, that by his name all receive remission of sins, who believe in him. [44] While Peter was yet speaking these words, the Holy Ghost fell on all them that heard the word. [45] And the faithful of the circuмcision, who came with Peter, were astonished, for that the grace of the Holy Ghost was poured out upon the Gentiles also.

[46] For they heard them speaking with tongues, and magnifying God. [47] Then Peter answered: Can any man forbid water, that these should not be baptized, who have received the Holy Ghost, as well as we?

So St. Peter himself, wonderfully illumined by God, refutes the pharisaic errors of the present time, by asserting authoritatively, that these unbaptized catechumens have received the Holy Ghost just as the baptized disciples had. And he had preached the Trinity, Incarnation, Passion and Resurrection, but had not yet mentioned baptism, so the desire for baptism was only implicit in these catechumens.

Hence, St. Augustine, "I do not hesitate to put the Catholic catechumen, burning with divine love, before a baptized heretic. Even within the Catholic Church herself we put the good catechumen ahead of the wicked baptized person . . . For Cornelius, even before his baptism, was filled up with the Holy Spirit [Acts 10:44–48], while Simon [Magus], even after his baptism, was puffed up with an unclean spirit [Acts 8:13–19]"

So also St. Thomas, "So also before Baptism Cornelius and others like him receive grace and virtues through their faith in Christ and their desire for Baptism, implicit or explicit"

So the clear testimony of the Holy Ghost, speaking through the Prince and head of the Apostles, in inspired Scripture as divine revelation strictly so called, with patristic Tradition and testimony confirming, is that the sacramental effect of baptism, just like penance, can be received in desire, which no one can lawfully call into question.

Nishant said:

The same St. Peter in the same book contradicts you magnificently.

If he contradicts what he said in Acts and 1Peter then he contradicts himself. It's pretty clear, baptism remits sins and baptism saves you. It's not my opinion, it's what he said.

Nishant said:

So St. Peter himself, wonderfully illumined by God, refutes the pharisaic errors of the present time, by asserting authoritatively, that these unbaptized catechumens have received the Holy Ghost just as the baptized disciples had.

What's your point? The catechumens received the graces necessary to believe and convert. It doesn't say that they don't have to be baptized now just because they believe.

Nishant said:

And he had preached the Trinity, Incarnation, Passion and Resurrection, but had not yet mentioned baptism, so the desire for baptism was only implicit in these catechumens.

Yes it was implicit. It doesn't say that their sins are remitted or that now they can die and go straight to heaven.

Nishant said:

Hence, St. Augustine, "I do not hesitate to put the Catholic catechumen, burning with divine love, before a baptized heretic. Even within the Catholic Church herself we put the good catechumen ahead of the wicked baptized person . . . For Cornelius, even before his baptism, was filled up with the Holy Spirit [Acts 10:44–48], while Simon [Magus], even after his baptism, was puffed up with an unclean spirit [Acts 8:13–19]"

Well what's your point again? I agree that the person, who is not inside the Church (Catechumen), but believes and loves all the doctrines of Christ, is better off than the person who is also outside the Church, but does not believe in the doctrines of Christ. I would say that it would be easier too, for the Catechumen to enter the Church than the Heretic to re-enter. This still doesn't change the fact that if either of them died in their respective states, they would be equally lost.

Nishant said:

So also St. Thomas, "So also before Baptism Cornelius and others like him receive grace and virtues through their faith in Christ and their desire for Baptism, implicit or explicit"

Ah, more qoutes not from the magisterium. Still, this doesn't prove that this belief will save them. Remember,

Mark 16:16 "[16] He that believeth and is baptized, shall be saved: but he that believeth not shall be condemned."

It is not enough just to believe but you must be baptized as well.

Nishant said:

So the clear testimony of the Holy Ghost, speaking through the Prince and head of the Apostles, in inspired Scripture as divine revelation strictly so called, with patristic Tradition and testimony confirming, is that the sacramental effect of baptism, just like penance, can be received in desire, which no one can lawfully call into question.

It's pretty easy to see that Peter is clearly saying that Baptism remits sins and is what saves a person. You are injecting your opinion where it doesn't belong and, as far as I can see, purposely distorting the teachings.
You really need to show some solemn statements saying that BOD is a way that can get people into heaven, because Catholics can show a lot of ex cathedra statements that say water Baptism is absolutely necessary to the exclusion of all else.