You're all over the map. Being a doer of the Word is not usurping Him by taking His place and trying to do for yourself what only He can do in you and through you.
There is a logical leap of meaning here.
If someone asks you to lay the table for food, you are not usurping the asker by doing
what they have requested, you are submitting to their instruction.
The boundary between justification and obedience has been blurred in these peoples minds.
If Christ commands us to do something, we do it because we love Him. By walking in
disobedience is sin, but obedience is somehow earning ones salvation, rather than just
following and walking in the relationship. There is a fascination about sub dividing
everything, and every action must be done for the right reasons and motives or it is sinful.
It invents a whole form of legalism and morality that was never there before and the Lord
never instituted, but get this wrong and you are doing evil. But not evil to send you to hell
but evil that will be burnt up at judgement. This is where they spend their energy, learning
the right rules for everything, except it is extra biblical, but definately not self justification, lol.