I came across this thread and post again Jon.
As I said in another thread, I am utterly confused how you might have access to truths such as the Bible, Solas etc without first verifying the authority of those who give it to you, in this case, the Lutheran Church. If the Lutheran Church cannot show a transfer of authority to itself from Christ, it cannot unfortunately teach anything. Do you understand this very important point?
The Lutheran Church would just be an arbitrary claimant to be able to teach but not worthy of assent.
So I honestly think that your idea that “Lutherans are Catholic apart from the Papacy” is a very weak argument. Lutherans are a group of people who assent to an authority that is unworthy of assent. Hence, a unreasonable religion.
Lutheranism has truths that it shares with Catholicism. BUT, it cannot ask for assent nor be assented to if one is reasonable. So for you, its either you become Catholic or continue to be unreasonable and give assent to the Lutheran church. Do you see the issue?
Also, by unreasonable here, I do not mean my opinion. I am referring to practical reason. You must be able to explain to a unbeliever as to how you went from Christ died and rose from the dead, to Lutheran Church has the authority to teach regarding Christ and his teaching. Unless you can do that, the Lutheran Church is not worthy of assent.