Perhaps then it boils down to “who” you believe, rather than just “what” you believe? It also depends on where a person has come from in their spiritual journey....
in Jesus’ day, he preached to his fellow Jews, who were already in a dedicated relationship with God. But he had issues with the teachings of the Pharisees, saying that they “taught the commands of men as doctrine”. (Matthew 15:7-9) so even though they had God’s word, they did not teach it correctly, but added many detailed explanations to it that were not necessary and that warped what God had originally said.
If the person or organization who teaches us has the wrong message to convey, shouldn’t we be informed about that?
As Paul said....
11 For the scripture says: “No one who rests his faith on him will be disappointed.” 12 For there is no distinction between Jew and Greek. There is the same Lord over all, who is rich toward all those calling on him. 13 For “everyone who calls on the name of Jehovah will be saved.” 14 However, how will they call on him if they have not put faith in him? How, in turn, will they put faith in him about whom they have not heard? How, in turn, will they hear without someone to preach? 15 How, in turn, will they preach unless they have been sent out?”
What did that mean back then to those first Christians?
If there is “the same Lord over all” then we should get to know him and the one whom he sent. (John 17:3)
Since the Bible does not teach that Jesus is part of a triune godhead, it is my belief that steering clear of that belief is a good thing. Jesus never said he was God...not once. To put another god in place of the Father is a breach of the first Commandment. (Exodus 20:3)
I guess that people in Christendom all believe the same set of core beliefs....and if you do not accept that core, then you cannot be acceptable to them as a Christian. But Jesus’ words at the time of the judgment are sobering because “many” are going to suffer complete rejection. It will shock them.
Matthew 7:21-23...
“Not everyone saying to me, ‘Lord, Lord,’ will enter into the Kingdom of the heavens, but only the one doing the will of my Father who is in the heavens will. 22 Many will say to me in that day: ‘Lord, Lord, did we not prophesy in your name, and expel demons in your name, and perform many powerful works in your name?’ 23 And then I will declare to them: ‘I never knew you! Get away from me, you workers of lawlessness!’“
So just acknowledging Jesus as your “Lord”, unless you are “doing the will of the Father” it means very little. When we are taught scripture and the value of it, we cannot afford to get things wrong. If God is the author of scripture, then there will be no contradiction or deviation from what is written in his word. There was to be no other scripture....no additions to what was written....and no other prophets because Jesus was the last prophet.
From creation to the final test of Revelation, all scripture must harmonize because it is inspired by the same author.
Since Jesus promised to resurrect both the righteous and the unrighteousness, calling them from the same place (their tombs. John 5:28-29) we can be sure that God’s original purpose for this earth and all the life he established here will finally be at realized (Isaiah 55:11)....all will be at peace with the Creator, reconciled through the sacrifice of Christ, his obedient son.
As far as “salvation” is concerned, well that is for Jesus to judge. From his words in Matthew 7:21-23, it is apparent that “many” will not make the cut, despite all the things they said that they had done “in his name”.
So from my perspective, there can only be one truth, and Jesus said that no one can come to him without an invitation from his Father. (John 6:44, 65) So as one who reads hearts, it is up to God to reveal his truth to whomever he wishes. But as history demonstrates, the God of the Bible is a God of order and organization. He has always had one people who were taught one truth (1 Corinthians 1:10) and they were gathered together for worship as one body of believers. (Hebrews 10:24-25) No one was allowed to bring in any beliefs from outside of what was provided by God in his word....
So that is how I see the situation.....we have to make the choice to worship the true God as he says he must be worshipped, not deviating to the right or to the left.....(Isaiah 30:21)