I always assumed that “flesh and blood” or carnality didn’t exclusively mean literal flesh and blood, for the simple fact that Christ Himself appeared to the disciples in the flesh even after His resurrection:
“And He said to them, `Why are ye troubled? and wherefore do reasonings come up in your hearts? See my hands and my feet, that I am He; handle me and see, because a spirit hath not flesh and bones, as ye see me having.'” And having said this, he shewed to them the hands and the feet. And while they are not believing from the joy, and wondering, He said to them, `Have ye anything here to eat?' And they gave to Him part of a broiled fish, and of an honeycomb, and having taken, He did eat before them” – Luke 24:38-43
“then He saith to Thomas, `Bring thy finger hither, and see my hands, and bring thy hand, and put [it] to my side, and become not unbelieving, but believing.'” – John 20:27
Now mind you, I understand that just prior to these verses, the doors were locked, and Jesus suddenly appeared, almost literally, out of thin air, so I don’t think His body was the same as it was before. But because He emphasized His “physicalness” (merely perhaps to prove that He was the same person who had been crucified mere days before), I always took that to reinforce the idea that it wasn’t our physical bodies, per se, with it’s various nerve endings and stimuli reception and tactile responsiveness, that was the real problem. Afterall, Christ plainly stated what the problem was:
“’Do ye not understand that all that is going into the mouth doth pass into the belly, and into the drain is cast forth? But the things coming forth from the mouth from the heart do come forth, and these defile the man; for out of the heart come forth evil thoughts, murders, adulteries, whoredoms, thefts, false witnessings, evil speakings: these are the things defiling the man; but to eat with unwashen hands doth not defile the man.'” – Matthew 15:17-20
“’The good man out of the good treasure of his heart doth bring forth that which [is] good; and the evil man out of the evil treasure of his heart doth bring forth that which [is] evil; for out of the abounding of the heart doth his mouth speak.’” – Luke 6:45
I don’t want anyone to misunderstand me here. I’m not saying that the physical nature of our bodies is anything good or is exempt from condemnation, for “’the spirit it is that is giving life; the flesh doth not profit anything; the sayings that I speak to you are spirit, and they are life’” (John 6:63), as well: "And this I say, brethren, that flesh and blood the reign of God is not able to inherit, nor doth the corruption inherit the incorruption" (1 Cor. 15:50), but I think the heart of the matter (pun intended) doesn’t remain so much with our physical nature, since even if we were to cut off our hands, or pluck out our eyes, that still wouldn't keep us from sinning.
I may be way off, but for the moment, that’s how I see things.
Rob