We recognize that people can have an emotional episode and feel that they are "saved" but that this can wear off. Or 20 years later a "Saved" person can have doubt or fall into sin. Our lives are not changed by a one-time decision, but rather by a lifetime of decisions to help be Jesus to the world.
True, this does happen...the "warm fuzzies" fade, the "spiritual adrenaline" wears off...and we learn to walk faithfully, by the strength He supplies, getting our nourishment from the word and the Spirit, and not rely on "feelings." He transforms us into His image "from glory to glory. This is the work of the Spirit, but we cooperate by our obedience....yet our resolve and enablement for obedience *also* comes from Him. It all goes back to HIM, which is why all glory is due Him.
I can't aruge with any of that. I would just add that you said you get your strength from Him from the word and the Spirit. We too believe this, but we believe that He gave us a special way to gain strength. We call them Sacraments and Communion is the main one we rely upon.
And we also believe that our transformation into His image can be completed after we die and before we enter Heaven.
SD