The gift of the Lord Jesus is His own EternalLife, which is relationship with His HolySpirit Joh 5:26.
There are two types of death: -> physical death Heb 9:27 -> spiritual death Rev 21:8.
Adam and Eve did not immediately die physically when they sinned. However, they immediately died spiritually Gen 2:17.
When a person sins, whether believer or unbeliever, the result is an aspect of death. Somethings shrinks or shrivels instead of growing when sin occurs Joh 10:10.
What is His life? -> His HolySpirit Joh 1:4.
EternalLife is another name for His HolySpirit.
To reject the Holy SpiritOfChrist Jesus is to reject Christ Jesus Himself Joh 8:19 Act 7:51.
We don`t receive Jesus when we believe on Him. Rather, we receive His HolySpirit in the NameOfJesus who manifests EternalLife in and through us Joh 3:5 1Jn 4:2.
The Holy SpiritOfChrist Jesus is who will raise us at Christ`s return Rom 8:11.
However, if we let sin reign in our mortal bodies we will suffer the consequences of that sin destroying our physical lives, our testimonies and our walk with the Lord Col 1:10.
Instead of us living a victorious, productive life with treasure laid up in heaven, we will be saved as by fire 1Cor 5:5.