What makes a “core” doctrine, and are they necessary for saving faith? For example, Mormons believe in Jesus, but many think they aren’t saved because of difference in core doctrine.
Hello Team, this is a fun question, and here it is in its entirity:
What makes a “core” doctrine, and are they necessary for saving faith? For example, Mormons believe in Jesus, but many think they aren’t saved because of difference in core doctrine. Every denomination has a different idea on what doctrines are “core” or necessary for salvation. How can we know right from wrong if each person interprets the Bible differently?
TLDR: When you change who Jesus is, you change the terms of salvation.
What Is Doctrine?
Let’s start with a simple definition.
Doctrine comes from the Latin doctrina, meaning “teaching.” In Greek, the word is didachē. We see this idea throughout the New Testament, especially in Paul’s letters, where he emphasizes to Timothy and Titus the importance of sound teaching (1 Tim 1:10; 2 Tim 4:3; Titus 1:9; 2:1).
So, doctrine is simply what the church teaches. That includes a wide range of topics like:
- The doctrine of grace
- The doctrine of church leadership
- The doctrine of the sin.
All of these doctrine are important.
But not all doctrine carries the same weight and I’ll talk about that in a moment.
Core Doctrine and Dogma
Within the wider body of doctrine, some teachings are more central than others. And this brings us to the question of Core Doctrine.
In the simplest terms, I would say, core doctrine refers to the essential truths of the gospel, meaning who Jesus is and how we are saved.
The historic Christian church has often referred to these core doctrine as dogma—and these core teachings have been consistently recognized as essential and non-negotiable for the Christian faith. Let me say that again: these core teachings have been consistently recognized as essential and non-negotiable for the Christian faith.
Non-negotiable doesn’t mean people never debate the core doctrine through the centuries. But it does mean they cannot be redefined without changing their meaning. And that’s important—hold onto that thought.
What Are These Core Doctrines?
So, what do core doctrine look like? I like to call “bullet doctrines”—as I would take a bullet before denying them because they define the gospel itself:
- God is one in essence, existing eternally as Father, Son, and Holy Spirit.
- Jesus is the incarnate Son of God, born of a virgin.
- Jesus lived a sinless life.
- Jesus died on the cross for our sins.
- Jesus was raised from the dead.
- Jesus reigns as King and judge of the world.
- Humanity is fallen and needs redemption.
- Salvation is by grace, received through repentance, faith, and allegiance to Christ.
Why Do Core Doctrines Matter?
So, the question asks, “are core doctrines essential for saving faith“—Well, Yes, as you see, these core doctrines are essential to our salvation. And here’s why.
These core doctrines act as guardrails around the identity of Jesus and the gospel story.
If those core doctrines are changed or redefined, you don’t just get a slightly different theology—you get a completely different story. And a different story leads to a different understanding of salvation.
Think of it like this.
If you have a bowl of chocolate ice cream, you know what chocolate tastes like. It’s unmistakable. Now imagine someone gives you a bowl of strawberry ice cream and calls it chocolate. You’d know something is wrong the moment you taste it.
They might both be:
- made of cream
- cold
- served in a bowl
But strawberry is not chocolate.
In the same way, when someone changes who Jesus is, they are no longer talking about the same Jesus—even if they use the same name and seem familiar.
That’s the same kind of difference that happens when the Jesus of the Bible is replaced with an alternative version.
What About Mormons (LDS)?
Let’s go back to the question:
“Mormons believe in Jesus, so why do some Christians say they aren’t saved?”
Because their Jesus is strawberry. I won’t go too deep into Latter-day Saint theology here, because that’s a much bigger discussion for another day.
But on the surface, LDS beliefs can look very similar to historic Christianity. They affirm that:
- Jesus was born of a virgin
- lived a sinless life
- died and rose again
So, what’s the issue?
The difference comes down to who God is and who Jesus is.
In LDS teaching, God, Jesus, and humanity are understood in ways that differ significantly from the historic Christian view of one eternal God and the unique, uncreated Son.
And as I said earlier:
- if you change the identity of God
- you change the identity of Jesus
- and if you change Jesus, you change the gospel
- And if you change the gospel, you are changing the terms of salvation.
There’s no getting around that. Strawberry is not chocolate, no matter how much you want to think it is.
Christians don’t say that Mormons are not saved to be mean or dismissive. The concern is that when the identity of God and Jesus is redefined, the message being believed is no longer the same gospel found in Scripture.
So, in its simplest form:
Different Jesus = different gospel = different salvation
That’s why core doctrine matters.
What About Denominations?
The question also stated:
“Every denomination has a different idea of what doctrines are core.”
Not quite, No.
Most Protestant, Roman Catholic, and Orthodox traditions broadly agree on these central truths about God, Jesus, and salvation. They believe in the same eternal Jesus, they believe in the same eternal God, and the same eternal salvation. Where they differ is in secondary doctrines.
Think of doctrines like a target.
At the center is Christ—the bullseye.
And around the center are the core doctrines—unchangeable truths about who He is and what He has done.
Then around these are more circles of secondary and tertiary doctrines—areas where Christians can disagree on subjects such as:
- the end times
- predestination and election
- baptism practices
- spiritual gifts
- styles of worship
These differences matter, but they don’t redefine the gospel, the core doctrine.
How Do We Know What’s Right?
So, the final part of the questions says:
“How can we know right from wrong if people interpret the Bible differently?”
It has always been true that Scripture requires interpretation. But these core doctrines have been consistently affirmed across the church throughout the centuries.
So, if an interpretation contradicts these core truths, it has moved outside the gospel.
That’s why Paul says in Galatians 1:8 LSB:
“But even if we, or an angel from heaven, should proclaim to you a gospel contrary to what we have proclaimed to you, let him be accursed!”
Paul is clear: the gospel is not something we get to reinvent.
This what the Later-Day Saints, Jehovah Witness, and Islam have all done. They have all redefined the Jesus, therefore, they have all redefined salvation.
When it comes to different ideas about salvation, core doctrine isn’t just about being right in an argument. It’s about knowing who Jesus truly is.
Because if we get Jesus wrong at the core of who He is, we don’t just miss a small detail—we miss the gospel itself.
And that’s why core doctrine matters.
And that’s why core doctrine is non-negotiable for salvation.