I said constant willful sin, and I defined it as non-believer, but you seem to have missed that completely.
It doesn't have to be "constant."
ONE SIN kills you. You cannot sin and not surely die. Sin ALWAYS produces death.
You have made a distinction between "willfully sinning all the time" (ie. constant willful sin) and "occasionally willfully sinning" (willfully sinning sometimes).
NEITHER are acceptable. The sin must stop, not become less frequent.
You stated...
Christ is in me but I shall not put on the incorruptible until I am also clothed in His immortality. My understanding is that happens following the resurrection and judgement of all. Until then, I am in the flesh, walking after the Spirit. Like you and everyone else, that means I will stumble and fall at times. It does not mean I live in constant willful sin. That is the sin of the unbeliever. Faith purifies our hearts. Scripture attests to this. I will die the first death like everyone else, but not the second.
You admit that you WILL stumble and fall and that the "stumbling and falling" is in contrast to "constant willful sin." Hence you are clearly advocating for SOME willful sin.
Why argue in favour of any sin at all?
The Bible clearly states that...
1Jn 3:6 Whosoever abideth in him sinneth not: whosoever sinneth hath not seen him, neither known him.
Obviously you don't "abide in Him" if you are still sinning on occasion. How could you view it any other way?
The Bible teaches...
1Jn 5:18 We know that whosoever is born of God sinneth not; but he that is begotten of God keepeth himself, and that wicked one toucheth him not.
John did not write that "whosoever is born of God sins only sometimes." He did not write that because "willful sin" is a result of this...
Mar 7:18 And he saith unto them, Are ye so without understanding also? Do ye not perceive, that whatsoever thing from without entereth into the man, it cannot defile him;
Mar 7:19 Because it entereth not into his heart, but into the belly, and goeth out into the draught, purging all meats?
Mar 7:20 And he said, That which cometh out of the man, that defileth the man.
Mar 7:21 For from within, out of the heart of men, proceed evil thoughts, adulteries, fornications, murders,
Mar 7:22 Thefts, covetousness, wickedness, deceit, lasciviousness, an evil eye, blasphemy, pride, foolishness:
Mar 7:23 All these evil things come from within, and defile the man.
When you sin where does it come from? It certainly does not come from a pure heart.
If your heart is pure then you won't be sinning.
Do you believe that your ongoing sinning is cloaked by grace? Do you believe that grace is somehow a cover for when you "willfully sin" occasionally? If you believe that then I would seriously reconsider that belief.
Grace is...
Tit 2:11 For the grace of God that bringeth salvation hath appeared to all men,
Tit 2:12 Teaching us that, denying ungodliness and worldly lusts, we should live soberly, righteously, and godly, in this present world;
Grace is what leads and quickens us (Eph 2:5). It is not a cover or a cloak. One cannot abide in the grace of God while they are still sinning. The sin has to stop.
[video=youtube;2NAseilIq-U]https://www.youtube.com/watch?v=2NAseilIq-U[/video]