Sidney Tapp, who wrote this curious book, was a lawyer. Having read it, I assume his principal weapon of the courtroom was the interminable repetitive monologue, by which means he would bore his listeners into submission.
Tapp's thesis is a simple, if rather eccentric one, which he could have expounded in a short monograph of, say, twenty or thirty pages. Instead he takes over three hundred, and as far as I can tell he doesn't actually address the question posed by its title until the two-hundred-and-fortieth. His idea is essentially the equation of sin and the fall from Eden with sex: the serpent in the garden is thus a symbol of the “sex-senses”. In fact the entire bible, in Tapp's reading, is concerned with the evil of sex; here, for instance, is a well-known passage from Genesis, together with his interpretation. Its insistence on such a weirdly counter-intuitive reading of the words as written is rather as if he had been employed by God to get Him out of an unprofitable contractual arrangement:
“And God blessed them and said unto them, be fruitful and multiply and replenish the earth and subdue it and have dominion over the fish of the sea and over the fowls of the air and over every living thing that moveth upon the earth” - Gen. 1:28.
It was not the Mortal Creation that God told to multiply and replenish - not the male and female of the Adam creation, but it was the Spiritual Creation that God told to multiply and replenish. “Be fruitful,” was His command to the Spiritual Entity - His child whom He created in His image; in spiritual ideas, thoughts and consciousness Adam and Eve did not create Sin. Man came into the consciousness of Sin - Sin existed at the creation. Understand and grow in spiritual consciousness, was God's command - “Multiply” in spiritual thoughts and spiritual ideas, and “replenish” - that is, refill the earth - the senses, with spiritual ideas and thoughts. Fill all consciousness with spiritual understanding, was God's command. Multiply in spiritual thoughts, until His spiritual universe is populated with the spiritual ideas of the mind of God, is God's command. “And subdue the earth” - the senses of the Mortal Creation; that is conquer permanently and overcome the senses of the Mortal Creation with Spiritual understanding. The word “Subdue” comes from the Latin “sub,” under, and “decere” to lead; that is, to lead the senses of the physical man in consciousness of the spiritual senses. By subduing the physical senses, we come into the consciousness of the spiritual senses and spiritual understanding.
After reading something like that, I want to subdue my physical senses with a strong drink - probably not the effect sought. But wait! you say - why, exactly, was Jesus a man and not a woman? Here's the answer:
Jesus had to be a Son and not a daughter - a man and not a woman - in order to undergo the temptation of the sex senses of the flesh - the mind of the serpent. Christ had to be God in mind and thought, in order to overcome this temptation and retain the image of God. The physical personality of Jesus had to be a man with the sex senses of the flesh in order to undergo the temptations of the mind of the serpent. The Christ had to be God in essence - the perfect spiritual idea of God's mind and God's conception and thought in order to retain the image of God in mind, thought and consciousness and overcome the sex senses in the personality of the man Jesus.
In terms of sex, tempting is women's work, whilst it is man's role to be tempted; Jesus had to be tempted, so of necessity he had to be a man and fulfill his spiritual destiny. This isn't, of course, all Tapp has to say on the subject but I'm sure you'll take my word that it doesn't get any better. (Personally I prefer to think that he had to be a man in order to be able to open the jar of anointing oil that Mary Magdelene was struggling with, but maybe that's just too obvious).