To say we can fall away is to say that we are more powerful than Christ.
No, it just means that He has not abrogated the free will that He created for us. He will/can hold us, but only if we agree. Even the angels chose to leave heaven. They have free will, as we do. God did not stop them from rebelling. To say that the angels were not created and existed in a state of grace and communion with God is absurd.
I the same way, humans can be in a right relationship with God, and choose to depart from it.
That we have the ability to keep Him from finishing the good work He began in us and that He is not able to keep us from stumbling and present us blameless before the presence of glory with great joy.
It is not about His ability, it is about our willingness. He is not going to save us against our will. He respects our choice, even if that choice is to profane the blood of the covenant.
Hebrews 10:29
29 How much worse punishment do you think will be deserved by the man who has spurned the Son of God, and profaned the blood of the covenant by which he was sanctified, and outraged the Spirit of grace?
If one has been sanctified, they were made holy by God’s grace, then chose to turn away from that grace. There is no other sacrifice for them.
If that is the case then we are finishing the work and not Christ. It would say “You have will finish the Good work Christ started in you” instead of “He will finish the good work…”
No, human beings are not capable of finishing His work in us. Our part is to trust, and walk in His grace. It is his part to perfect that which He began in us. This is why we call it synergistic, rather than monergistic. “Work out your salvation” means that we cooperate and “work together with” the grace through which we are saved by faith.
If you lose it then it wasn’t true faith.
This statement is an accurate expression of Calvanistic Theology. It was not found in the Church until the Reformation. It is considered an innovation, and a “different doctrine” than what we received from the Apostles.
So we have the ability to tell Christ what to do?
Christ wants all to be saved, and come to the knowledge of the Truth. Yet, He has created us with free will, and we can choose not to enter into the plan He has for us.
29(All the people, even the tax collectors, when they heard Jesus’ words, acknowledged that God’s way was right, because they had been baptized by John. 30 But the Pharisees and the experts in the law rejected God’s purpose for themselves, because they had not been baptized by John.) Luke 7
Jesus brought salvation to the Jews, but the Pharisees rejected His purpose for them. They did not have faith.