What is your definition of orthodoxy?
Anything that is NOT orthodox.
Does orthodoxy exist on this side of heaven?
Of course it does. Any time the Lutheran divine service is being conducted and the sacraments distributed.
Also, in our vocations rightly practiced (we're only in church once a week - and less if we're good Lutherans.)
I am asserting that orthodoxy and confessionalism are the same thing - make it Lutheran orthodoxy or Lutheran confessionalism.
If it doesn't, what does it mean to be a Christian?
If orthodoxy or confessionalism doesn't exist, then we're without hope. It's all for naught.
If it does, are you under orthodox teaching?
Yes, back to the existence question: anytime we receive the sacraments (at church) and our vocations (not at church).
How does a person decide whether or not a teaching/practice is orthodox?
Without getting all circular, a teaching/practice is orthodox if it creates faith alone.
If a person found orthodoxy, how should he handle unorthodoxy?
By correcting it with orthodoxy. Sometimes gently. Sometimes harshly.
How did Jesus handle unorthodoxy among the religious?
Pharisees and Sadducees had one description: brood of vipers.
Again, Jesus did it gently or harshly. Pick your passage.
Are we called to handle it in the same way?
Sometimes. Think of how you were disciplined. How you might discipline Olivia?
That's the art of the Lutheran pastor or the Lutheran parent that I haven't figured out yet. How do I apply a balance of Law and Gospel?
What is the relationship between orthodoxy and unity?
They are directly proportional.
Which is more important?
Orthodoxy/Confessionalism. You never sacrifice truth for unity. Otherwise you get more Benke BS and Oprah Fests.
Assuming orthodoxy exists, is it okay to call unorthodoxy "wrong"?
Yes. MOF, it's a must. You call sin like it is. EX: "Abortion is murder" not "a choice".
Assuming orthodoxy exists, and unity is a goal, how is that goal pursued?
IMO, unity won't come 'til Christ returns.
So what do we do until then? Reference Luther when asked what he would do if the world was going to end, "I'd plant a tree." Wow!
We press on with our lives (mostly humdrum, few times exciting). Receive the Holy Sacraments and do our blessed (and sometimes wretched) vocations.