They certainly did; with the leading of the Holy Spirit...
and the vast majority of Christians do believe that God continues to preserve oral teaching without error as He did the Scriptures ...
When you say vast majority, I'm sure you mean the Catholics...But let's consider; Catholics are counted because their name is on a list...And there's a big bunch of them...
As of late, the Catholics on these FR threads are claiming that many, probably half or way more than half are Catholic in name only...So are they counting those as well??? They don't even believe your church dogma, how can you count them as Catholics???
and the vast majority of Christians do believe that God continues to preserve oral teaching without error as He did the Scriptures
It doesn't matter how many people believe what...What matters is what God said...And why do they believe this??? Did they read it in God's spoken word??? No they didn't...They got it from your church...
I think it's interesting that you reference the "spoken word of God," but you also seem to think that men have the power corrupt it.
Paul knew the same thing...When you say it's ok NOT to break the bread at communion, you are corrupting the word of God...When you say you don't have to drink the wine at communion, you are corrupting the word of God...And on and on and on...
God already layed these thing out before the Apostles...Your group has no Godly authority to change any of it...