One more time for those with learning difficulties:
Sola Scriptura is in contra-distinction to Papal authority for faith and doctrine.
It's not about Scripture only for salvation.
It's not about interpretation of Scripture.
It's not about the "words of Scripture only."
It's not about the meaning of Scripture.
It's not about doctrines of Scripture.
It's not about if it is in Scripture.
It's not even about what is Biblical.
It's about one thing and one thing only--spiritual authority.
Protestants maintain Only Scripture has spiritual authority for faith and doctrine, not any one on earth.
Now listen up and pay attention.
Sorry, Sola Scritptura is, indeed, an interpretation. or, an opinion.
Your claim is that scripture is the only authority for faith and doctrine. Yep
The Book of Mark is doctrine. How do you know Mark wrote it? How do you know the writer was divinely inspired?
Your wedding liturgy contains solemn vows, rituals, and the holy joining of two people before God. The liturgy contains official language contained in a document. Where?
I know you won't answer, but that's OK