Maybe there's a bit of confusion going on here.
When scripture speaks of God as immortal, (1 Tim 6) the meaning is that God has no beginning or end. That is the more precise meaning of the word "immortal" in Christian theology.
When scripture speaks of man as immortal, (1 Cor 15) the meaning is that man, as a created being, does have a beginning but that, after the resurrection, he will have no end. So, in Christian theology, the word "immortal" when applied to man, is not the same as when referring to God.
That's why 1Co 15:53 (RSV) says: For this perishable nature must put on the imperishable, and this mortal nature must put on immortality.
Our nature, as created by God and damaged by sin, is now perishable and mortal. At the resurrection, our nature will "put on", as something unnatural to it, imperishability and immortality. It will put on those attributes because Jesus, by His death and resurrection, has destroyed death and perishability.
iakov the fool
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Jim,
This is so well said, especially your noting the content of 1 Cor 15:53 (RSV) where human beings put on immortality. In spite of God being the only one who is immortal in the sense of having no beginning or end, human beings will become immortal.
The dynamic equivalence of the New Living Translation translates 1 Cor 15:53 (NLT) as, 'For our dying bodies must be transformed into bodies that will never die; our mortal bodies must be transformed into immortal bodies'.
Oz