Your theology depends on Luther being in heaven.
This you do depend on him unlike what you wrote.
Luther had his time on earth to do the same. When we get to heaven - those of us who are actual believers in Christ - we'll see.
Unfortunately, I won't be able to tell you unless you entrust yourself to Christ alone before your death. Guess if you don't, you could ask around down there...
but it will be on you, bro. Why don't you be sure today. Tomorrow is uncertain. Yesterday is gone. Scripture says that Today is the day of salvation. May it be yours.