At the end of the day, what truly matters is who is in Christ and who is not—who is sealed with the Holy Spirit and who is not. It’s not about church creeds or dogmas.
J.
Im a firm believer that Gods kingdom has many mansions, there are holy people in all of the outposts.
On that I will agree. For my part I claim that only in the Catholic Church is the fullness of faith,
Because what you said “ who is in Christ” is a product not just of faith, but who “obeys” what is asked of them
So John 3:36 tells us, that that determines eternal life, ie who is in Christ.
So then you ask what must I obey?
For which the church and teaching as creeds or dogmas do matter,
which stem from studying the early church taught by apostles ,
All of this ends up circular. When we say to Protestants but you don’t agree on most matters , and you can be sure that on most matters your pastor is contradicted by another just down the road. So How can either claim the truth?
The Protestant replies but we agree on the “essentials” . To which we reply you Can’t even agree what are essentials!
Like the necessity, meaning, method, applicability and efficacy of baptism! It’s either needed or not. You obey or not, and it is dire if you don’t. John 3:36
In john6 the Eucharist is essebtial to life,
Some well known protestant theologians have changed the list of what is “ essential “ as time went on. How essential is that?
Yet the book you read - scripture - to decide these questions was provably a decision of the church , before which faith was handed down by word of mouth and letter “ tradition”, The earliest church tells us what they believed , which was listen to the bishop , where he is , so is the church, only those who are “ sent “ can preach.
In short you cannot divorce the question of who is in Christ , without reference to the true church.
It is not just a spiritual Union,
The foundation of truth - the church -is the household of God to whom you are told to take disputes on what is “ essential” so who is in Christ.