Harry Blake wrote: " "In the twinkling of an eye the dead shall be raised imperishable and we shall be changed" (1 Cor 15:52) In other words we're changed from squishy fleshy humans into purely spiritual life-forms, regard it as the final step of human evolution."
Well, the first is a quote, but the second is an inference.
In Second Corinthians 5:17 (which is about this subject) we find the phrase "old things have passed away; behold, all things have become new".
We find the same phrase repeated in Revelation 21:5 "Behold, I make all things new."
And in fact there is some indication of this in the first verse of the same chapter:
21:1 "Now I saw a new heaven and a new earth, for the first heaven and the first earth had passed away. Also, there was no more sea."
It's hard to see how the meek shall inherit the earth (Matthew 5:5) if there is no earth and everyone is noncorporeal in a noncorporeal realm.
Looking at the chapter of First Corinthians you have quoted, we see in the preceding verse (15:51) "We shall not all sleep, but we shall all be changed". Insofar as "sleep" refers to death, this says that not all will die, but that all will be changed.
And 15:42 says that "The body is sown in corruption, it is raised in incorruption." It doesn't say that the souls of the dead are raised, it says that the body is raised.
Where are the souls of the dead after death, and how could a "resurrection" be possible if souls already free of the body remain noncorporeal?
Luke 20:37-38 says: "But even Moses showed in the burning bush passage that the dead are raised, when he called the Lord "the God of Abraham, the God of Isaac, and the God of Jacob". For He is not the God of the dead but of the living, for all live to Him."
What does that mean, "all live to Him"?
Matthew 19:28 which I quoted earlier uses the term "regeneration". You do not regenerate immortal souls.