I accept that, but I have always wondered about suicide in the face of capture by some Indians for instance, when many Christian Americans would kill themselves (and their children) rather than be captured by people who were experts in torture from lifelong study of pain and how to inflict it, while keeping a person alive for days.
I have also wondered about a soldier or aqent who knows too much to be taken alive, and must kill himself.
Re: the question of suicide by a believer.
Obviously a believer who acts on suicide is not acting through faith in Christ. Take a look at John from Tertullian’s testimony, was thrown into a boiling cauldron, but was protected and survived.
Adversity is inevitable in life and in death, but stress is optional, simply by faith in Christ. His Plan prevails over our plans.
There are many who might develop a false doctrine of works or of perseverance, who will rationally argue suicide mandates eternal condemnation, because we aren’t in fellowship with Him immediately prior the first death. This fails to recognize other doctrines, such as the sealing of the Holy Spirit and our sonship as members of His Royal Family. Even if we reject Him after being made part of His family, He still loves us and hasn’t removed us from His family.