Our current flesh was made for this world. Adam is from the dirt. He was created good in body and soul. We needed a glorified body that was fit for heaven.  This is not because the flesh is evil, but because the flesh is earthy.  In our fallen state, the curse is that the body will not be glorified, but by the redemptive work of Christ, we are guaranteed to be glorified as we are in Christ.   Therefore, rather than seeing our bodies as unimportant or disposable, we should recognize that God not only created us with a good body, but Christ redeemed us as whole humans: body and soul.