Here is the theological basis for it – ‘the first man Adam was made a living soul.’ It is safe to read there an animal soul, because you are a human being, but you have a physical body, an animal body, with a soul.
Now, this brings a mystery, because there are two things said here: ‘The first man Adam was made a living soul; [and] the last Adam [which is Christ] was made a quickening spirit’. We know where the first comes from. It comes from Genesis 2.7; it is almost a direct quote. But where does the second come from? Here is one reason why we suppose that, the Gospel of John, in spite of what people say today, may well have been written even before the apostle Paul wrote 1 Corinthians, because these words are certainly in the apostle John: ‘Verily, verily, I say unto you, The hour is coming, and now is, when the dead shall hear the voice of the Son of God: and they that hear shall live. For as the Father hath life in himself; so hath he given to the Son to have life in himself’ (John 5:25-26). So too in John 1:4, ‘In him was life’. But then, it is probably in Psalm 36 also, ‘For with thee is the fountain of life: in thy light shall we see light’, and in Deuteronomy 30.
‘The last Adam’ – notice that it is ‘the last Adam’. The old preachers always used to pause there. You find this in the old sermons. They would always labour this point – it is not actually the second Adam. The second Adam is a phrase which we shouldn’t really use it. It does not come from the Bible, but from a hymn, and the hymn writer probably meant to say the last Adam, but he had to make up the number of syllables in the line, so he went for the second Adam. But actually it is the wrong thing to say. Christ is not a second Adam. It would be no good at all to have a second Adam, if that implied he was no better than the first one. Then the second Adam would fall just like the first one.