"No beginning and no end" means "everlasting" or "eternal". "Immortal" means not subject to physical death. God has immortatlity until the resurrection, at which point all the saints will also be immortal. We should never go with half truths.
For this corruptible must put on incorruption, and this mortal must put on immortality. So when this corruptible shall have put on incorruption, and this mortal shall have put on immortality, then shall be brought to pass the saying that is written, Death is swallowed up in victory. (1 Cor 15:53,54).
What was Paul talking about? The resurrection of the saints at the Resurrection/Rapture of the Church.
Christ the eternal Word of God chose to take a human body and made Himself voluntarily subject to death for our salvation. But God the Word was eternal, and He is now in an immortal glorious and glorified body. And all His saints will resemble Him, to the praise of the glory of God's grace.
I am speaking of RIGHT NOW we are mortal not the future when God changes us and our physical bodies and giving us eternal life.
That is the full truth not a half truth. I believe you knew I was also talking of right now.....