Thus comes the question that has been in my mind. “Is this belief essential to salvation?” I absolutely believe it is not. But there are those who believe it is. And if it is, then the death and resurrection of Christ is diminished and his scarificial blood made of no effect.
I’m sure that others will be able to better answer this question but I shall make an attempt.
The Term “Believe” can take on different aspects.
We can “Believe” something because we’ve witnessed it ourselves.
We can “Believe” something because we have studied on it and are convinced of it’s truth.
We can Also “Believe” Something because Someone we Trust tells us it is so.
There is also a “Belief” whereby we can “accept” something as True even though we don’t fully understand it, have not witnessed it, and indeed cannot witness it, but rather must take another’s word for it.
A simple example of this is the solar system. From our perspective the sun rises. moves across the sky and sets while we stand still. Yet the scientific community tells us that what we see as rising and setting is, in reality, our moving in relation to the sun and not the sun moving in relation to us.
We accept this explanation and the proofs even though we cannot personally “witness” the belief.
I know that this is an overly simple example but it illistrates the basic point.
To relate this to Dogmatic Declarations of the Church, i.e. necessary for salvation and how and why we accept them.
First of all is the acceptance of The Church as Christ Established and having Christ’s own Protection and Authority. This Authority which includes the Authority to Bind and Loose. This means we accept the teachings of the Church as being from Christ Himself and we obey them as such.
Secondly we look at the idea of “Believe” as we examined it above. The Church teaches that we need to accept the Dogmatic Teachings as necessary for salvation. Now depending upon my “intellectual capacity”, or ability to research the Dogmas, or other factors, I may not fully understand a teaching, but I can accept the teaching as valid because The Church teaches it and The Church has Authority Directly From Christ.
Finally, as relates to your final statement:
“then the death and resurrection of Christ is diminished and his sacrificial blood made of no effect”
When we accept Christ as our Savior, we accept a certain lifestyle and set of beliefs and behaviors connected with it. If we do not accept these beliefs then our profession is meaningless. For example, if we profess Christ, but continue to lie and cheat, our profession is of no use. Does this Change the Salvic Quality of Christ’s Sacrifice? Of course it doesn’t. It effects OUR ability to utilize the Graces that comes with acceptance and repentance.
We accept, whether Catholic or Protestant, that the Teachings of Christ contained in the gospels are necessary to Salvation. Love of God, and neighbor - Faith, Hope, Charity, - The Beatitudes and so forth. We accept these things as pointing out how we should live as followers of Christ. Are these things “necessary” for salvation? Of course they are. Not that we will follow them perfectly as Christ did, but because Christ told us that this is how we should live.
Now we also believe and accept, as Catholics, that Christ founded a visible and authoritative Church upon Peter and gave that Church Authority. He even told us to abide by the Church’s decisions even if we don’t fully agree with or understand them. (See: Matthew 16: 15-18) (Tell it to the Church) Therefore, we accept the Dogma’s of the Church as coming directly from
Christ through His Church just as we accept those teachings found in the Gospels. Again, does this diminish the Salvic effect of the Cross? Of course not. It only effects our ability to fully participate in that Salvic act.
If we have serious doubts about a dogma, we should attempt to resolve that doubt by either reading the pertinant documents directly, or speaking with someone knowledgable who can give us good spiritual direction.
If we still have doubts, we should submit our will to God through His Church, just as Christ commands us in the above passage. We accept the Teaching because we accept that Christ is with His Church and He wishes for us to accept and believe this teaching.
I apologize that this is a bit disjointed, my DW is not having a good morning and I’m in and out.
I hope this helps some in understanding.