OK, I'm gonna jump in here with one of the few things I remember from my JW days....
The idea behind this, at least according to the JWs, is that 'perfection' on earth is not how we normally think of it.
When a perfect earth is spoken of, it doesn't mean that diseases or pain wouldn't exist. They used those medical papers that go on about people who are born without pain receptors being in a very bad place. They have to spend a good chunk of their lives examining themselves for serious damage they may have unknowingly been subjected to, and use those as evidence that pain, in itself, is good and serves a purpose.
What 'perfection' means is that we would never succumb to anything or suffer permanent damage. IE, if you caught the Ebola virus, you'd likely suffer nothing more than minor flu like symptoms, and would be guaranteed a recovery from it. Or, if you slipped and broke your leg in two places, it would still hurt, you'd still be laid up for awhile, but you again would be guaranteed a full recover with no permanent structural damage to your bones.
So, according to them, our immune system didn't develop because of "the fall", we always had it. But now it's imperfect and can't function as fully as it could under a perfect earth.
The idea behind this, at least according to the JWs, is that 'perfection' on earth is not how we normally think of it.
When a perfect earth is spoken of, it doesn't mean that diseases or pain wouldn't exist. They used those medical papers that go on about people who are born without pain receptors being in a very bad place. They have to spend a good chunk of their lives examining themselves for serious damage they may have unknowingly been subjected to, and use those as evidence that pain, in itself, is good and serves a purpose.
What 'perfection' means is that we would never succumb to anything or suffer permanent damage. IE, if you caught the Ebola virus, you'd likely suffer nothing more than minor flu like symptoms, and would be guaranteed a recovery from it. Or, if you slipped and broke your leg in two places, it would still hurt, you'd still be laid up for awhile, but you again would be guaranteed a full recover with no permanent structural damage to your bones.
So, according to them, our immune system didn't develop because of "the fall", we always had it. But now it's imperfect and can't function as fully as it could under a perfect earth.