True - But they forgot to read it, and screwed it up so badly that the Protestant Reformation was necessary to restore Christianity!
The "Reformation" that started by denying the power of the Holy Spirit by throwing books out of the Bible because the Holy Spirit was wrong to allow them to be included in and accepted as Holy Scripture for over fifteen hundred years.
That's not a "Reformation", it's a denial of both the Holy Spirit and the Trinity that replaced the Holy Spirit with Self and Self Alone, something that Scripture calls elevating man above God along with blaspheming the Holy Spirit which Scripture explicitly states cannot be forgiven in this life or the next.
People claiming to live by faith alone after starting out by stating they have no faith in the Holy Spirit are just sad lost sheep under a powerful delusion.
As long as they defend that delusion thinking they're doing the right thing rather than getting on their knees and begging for the Grace to study the Scriptures without their blinders (including the books they threw out because they claim Holy Spirit couldn't and didn't protect His Word from error) they're on the road to their own destruction.
have a nice day