Yes, as a reference, most Catholics I've met aren't this dense. However, if you are sincerely perplexed, I am not too surprised since doctrinal origin hasn't always been a Catholic strong point.
Does your doctrine, written by men, that references Scripture have more authority? What's it's purpose?
The authority for the doctrine comes from Scripture, otherwise it is invalid. Again, I believe the Catholic intention here are to be purposely obtuse to lend more credibility to their practice of making up doctrine of whole cloth, without Scriptural justification, hence the need for 'sacred traditions'. Can't find it in the Bible, make it up and create a sacred tradition to uphold it.
And round and round you go.
No, it's not obtuse at all: it is making the same point. Scripture has no "authority" for doctrine on its own - if it did there would be no need for doctrine referencing scripture, no need for doctrine at all.
Doctrine is made by men based on these men's interpretation of scripture, which they reference. Same scripture, same reference, different doctrine.
Here is the ELCA's Statement on Sexuality.
Same Lutheran foundation, same confessions and Book of Concord, same Scriptures. Very different doctrine.
The only difference that makes a difference in doctrine and practice is in who has authority to say so.
The same is true in your church. This is my same and only point.
You may go round and round in your position again now.