But he has not get given that eternal life.
As he explained to Nicodemus it can only come in a new, immortal body.
As usual, you appear to be trying to make a specific condition out of a generality.
Yeshua himself said in Matthew 24 that only those that endure to the end shall be saved. So while no one can pluck us out of his hand, we are free to leave his hand by our own volition. Paul and Peter explained this fact in great detail in Hebrews 6, and 2Peter 2.
It just requires a less tendentious mode of reading, so that one gets God’s meaning rather than one’s own desire.
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By refusing to see Scriptures teaching ‘dispensations’ one can con veniently reject the sound reasoning available by viewing to whom a passage is aimed, by whom, and for what period at issue. In refusing to see Scripture plainly teaches ‘dispensations’ by this they do err ...
I suppose if you refuse the guarantee of the Holy Spirit you would be right.
1 John 5:13 These things have I written unto you that believe on the name of the Son of God; that ye may know that ye have eternal life, and that ye may believe on the name of the Son of God.
John 5:24 "Truly, truly, I say to you, he who hears My word, and believes Him who sent Me, has eternal life, and does not come into judgment, but has passed out of death into life.
Ephesians 2:8 for by grace ye are having been saved, through faith, and this not of you -- of God the gift,