Question — If a Christian has no fruit in his life, is it possible he was never saved?
Answer — Let’s look at Matthew 7:15-20:
Beware of false prophets, which come to you in sheep’s clothing, but inwardly they are ravening wolves. Ye shall know them by their fruits. Do men gather grapes of thorns, or figs of thistles? Even so every good tree bringeth forth good fruit; but a corrupt tree bringeth forth evil fruit. A good tree cannot bring forth evil fruit, neither can a corrupt tree bring forth good fruit. Every tree that bringeth not forth good fruit is hewn down, and cast into the fire. Wherefore by their fruits ye shall know them.
This passage is not about Christians, but false teachers. The presence or absence of fruit in a Christian cannot be used to determine whether he is saved. Many lost people live moral lives, but are bound for Hell because they have not accepted Christ as Savior.
Fruit is a means of determining whether a teacher is genuine, not saved.