In Jn 6:51, Jesus says that a person must eat "of this bread" in order to "live forever", and that "the bread that I give IS my flesh". In Jn 6:63, Jesus says "... Unless you eat the flesh of the son of man and drink his blood, you have no life in yourselves." In Jn 6:54-55, Jesus says, "He that feeds on my flesh and drinks my blood has everlasting life..." and "... for my flesh is true food and my blood is true drink." Do you partake of the flesh of Christ, as Jesus commanded, in order to have life in yourself and in order to live forever?
It should be noted though, that having life in oneself means that ultimately those who are born again will become immortal and indestructible spirits.
Conversely, the vast majority of mankind will receive an earthly resurrection. Even those who were unrighteous and godless will be brought back to life. For them it was not necessary to acknowledge Jehovah or Christ in any way, yet the prospect of everlasting life (not immortality) will be set before them based upon their life course after their resurrection. That is why Jesus called it a “resurrection of judgment.”