It is impossible to renew such a person to repentance. This means that such a person cannot not be brought repentance in their apostate condition. They must abandon that form of life and come back to the throne of grace with true repentance. I also need to make clear what true repentance is. It is thought that as soon as those words are uttered, all the sin is wiped out instantaneously.
Biblical repentance paints a much different picture.
Repentance is an act of the heart, not the mouth alone. There is no true repentance without godly sorrow. Consider the following words of the apostle Paul. Now I rejoice, not that you were made sorry, but that your sorrow led to repentance. For you were made sorry in a godly manner, that you might suffer loss from us in nothing.