But when two teachings contradict each other, one of them HAS to be wrong. We try to educate people to what the Scriptures actually teach. That way, we can all be right.
Or both are wrong. It depends on what the teaching is and what the interpretations are about.
I am very surprised to see Lutherans engage in the same argument that the Catholics use. We are correct and everybody else is wrong.
What I am seeing so far is:
The Catholics point to Apostolic Succession and the chair of Peter.
The Lutherans to the Interpretation of Scripture and the Confessions.
When talking about non-denominational Churches it is impossible to put them all into the same category because their teachings vary so much!
So while in the general sense it seems that they may all be on the same sheet of music, nothing is further from the truth.
What motivates the non-denomination? What is their statement of Faith? What Sacraments do they practice? In what way are those Sacraments practiced?
The warning goes to any Church really, regardless of their denomination. If the Preacher is preaching a different Gospel than that of Jesus Christ, their denomination is not going to save them.
Just like saying I am a Christian does not make me a Christian.
Generalizing does nothing but instigate fights and misconceptions.
Being a Catholic does not make me right any more than being a Lutheran makes me right any more than being a non-denominational makes me right.
The manner in which I practice my Faith in Christ and the obedience that follows is what makes a difference. That still doesn't make me right, as only Christ is right.
I am as careful with a non-denom as I am with a Lutheran as I am with any other denom.
We ask you, brothers, to respect those who labor among you and are over you in the Lord and admonish you, and to esteem them very highly in love because of their work. Be at peace among yourselves. And we urge you, brothers, admonish the idle, encourage the fainthearted, help the weak, be patient with them all. See that no one repays anyone evil for evil, but always seek to do good to one another and to everyone. Rejoice always, pray without ceasing, give thanks in all circumstances; for this is the will of God in Christ Jesus for you. Do not quench the Spirit. Do not despise prophecies, but test everything; hold fast what is good. Abstain from every form of evil.
(1 Thessalonians 5:12-22 ESV)
Peace!