Seems like you are looking at faith more than Jesus Christ, as that saves the man. Jesus Christ is the savior, not something else, not faith. Faith is just through which Jesus saves the man. And this faith isn’t one that does not remain, but that endures to the end.
Tong
R1550
There is a saving faith that does not endure to the end (Luke 8:12-13). It saves from sin (Matthew 1:21, Titus 2:14); just not from the final destination of hell; because in time of temptation they fall away.
And I believe that He will not fail and does not fail
Here, in 1 Corinthians 13:8 and Revelation 19:6, it appears that we have the concept of Irresistible Grace. Let us assume that it is the case therefore.
With the concept of Irresistible Grace comes 1 of 2 doctrines:
1) Limited Atonement, if God does not desire to save every man.
2) Universalism, if God desires to save every man and Irresistible Grace is the reality.
It is not Limited Atonement because God is not willing that any should perish but that all should come to repentance (2 Peter 3:9); and because He gave Himself as a ransom for all (1 Timothy 2:6); and because Jesus is the propitiation for the sins of the whole world (1 John 2:2); and because He wills all men to be saved and to come to the knowledge of the truth (1 Timothy 2:4).
It is not Universalism because there is a very real hell that people go to (Matthew 13:41-42, Matthew 13:49-50, Matthew 25:46, Matthew 7:23, Matthew 25:41).
Therefore Irresistible Grace cannot be the reality.
What then, does the love of God never fail to do?
It never fails to give every man a choice of whether he will walk in righteousness and be saved, or else continue in sin and perish in hell. Jesus is the only way by which a man can enter into and keep righteous living.