In a word, if faith in the finished work of Christ does not both ignite and fuel whatever might be thought of as “obedience”, it is sin, period. Apart from faith, unbelief has a hold, no matter how much our works “appear” like the fruit of the Spirit.
The Gospel then continues–as when we first began to believe–to shape (contextualize) all genuine (evangelical) obedience unto God, being the very reality here and now of Christ’s ongoing mediatorial mission.
Am I preoccupied with the question of obedience? Yes (not mine, but Christ’s). I strive, in faith, to keep ever before me His righteousness, as I hear and heed the call to reflect His image unto God and man.
This, I believe, is distinctly missing from much of what’s said regarding discipleship.