I'm confused as to what a spiritual resurrection is. Does that mean the spirit is trapped in a deceased body until it is resurrected? It's just a concept that makes no sense.
Luke 21:41-43 And while they yet believed not for joy, and wondered, he said unto them, Have ye here any meat?
And they gave him a piece of a broiled fish, and of an honeycomb.
And he took it, and did eat before them.
Spirits have no physical hands to carry the food to their mouths. They have no physical mouths to chew with. They have no physical stomachs to digest food. In short, spirits are incapable of eating. By eating, Jesus proved to His disciples that He was flesh and blood, and not a spirit. The facts of His being able to be touched by Thomas as well as His being able to eat prove His body was not destroyed.
http://carm.org/jesus-resurrection-was-physical
This link goes more into the physical resurrection of our Savior. Hopefully it'll help with the insight you need to deal with the JW's.
Over the years, I've gotten this out of the Holy Scriptures. God created everything to be eternal. God created man in His own image as well. Therefore, God created us, in His image, to be eternal. We are created as physical beings, not spiritual beings. Sin is what brought death and decay into the world. This is NOT by the will of God, it is by the iniquity of mankind. Upon the death of the physical body, the spirit does not remain in the body as is evidenced by reading the story of Lazarus in Luke 16 and 1 Samuel 28:14. The spirit needs no resurrection. The death and decay of God's image pleases Satan, not God. Satan and the demons hate God, His image and His creation. Jesus' sacrifice on the cross overcame death. One day death will no longer exist!! Jesus is first born from the dead, physically, to confound the hatred Satan has for God and His image. To allow His image to remain in a decayed state is to allow Satan the victory. To resurrect His image affirms the limitless power of the Living God, and makes Satan the loser.
Satan will lose, the history of his defeat was written millenia ago. All things will be restored because it is the will of God that it be so.
Acts 3:20-21 And he shall send Jesus Christ, which before was preached unto you:
Whom the heaven must receive until the times of
restitution of all things, which God hath spoken by the mouth of all his holy prophets since the world began.
Spiritual resurrection, whatever that is, can never fulfill the requirement for the restitution of all things. The bodies of the dead must be restored as well, else all things will not have been restored and God will be a liar. He is not a liar and all things shall be restored!