Jesus, the Son of God, died for our sins. He then rose and if we believe in him, we will join him and have everlasting life. We are saved by grace, not works. His sacrifice was perfect, there’s no way to warm it.
Roman Catholic Church does not teach that. I do know some people who call themselves catholic, but I consider them Christian because of their beliefs.
In a real quick nutshell that is it. A public baptism as an adult is showing obedience and a public affirmation of one’s faith too. There’s a lot of things that the Roman Catholic Church does which are not of God.
Not many people are going to change their mind. I know this,but if just one does, that’s great.
Since scriptures do say that “whole households” were baptized, infants and children, those are public also.
There are those adults who do come into the Catholic Church via baptism, it is called the RCIA.