What in the creeds is not confirmed by scripture? What in the creeds is not rightly reflecting the truth of the Gospel?It is a contradiction because in the one you say lutherans are required to believe even though not in scripture where as the other you say they are not required to believe because it is not in scripture.
Please take a look at that again. If they are not required to believe one thing because it is not in scripture, then why are they required to believe the other which you stated is not in scripture?
Holy Theotokos speaks directly to the Incarnation - Christ fully man and fully God at His conception. The Incarnation is central to our understanding of the nature of the Savior - an article of faith, directly related to Salvation. It is very Christocentric. The Assumption, however reasonable, is not directly related to salvation - not Christocentric. It also isn’t contradictory of scripture, leaving folks like me to believe it. So, while Theotokos is doctrine, the Assumption is idiaphoron.
This is the role of sola scriptura, not to deny or exclude Tradition, but to confirm Tradition when it rightly reflects scripture.
Jon