Oh?
I thought the evidence shows that Rome's minions really have no SCRIPTURE to back up their attempts at authenticating Rome's various 'doctrines'.
Show me the passage where it says everything has to come from scripture. There is at least one that says scripture and oral teaching.
Since you like scripture only, interpret this for me. This is my body!
Seems like a well known guy stated that once and it seems pretty straightforward to me.