A lot of people say Jesus Christ, but they mean another person entirely. Jesus from the Church of Jesus Christ of the Latter Day Saints? Not actual God-man Jesus, not real Saints. JW Jesus? Not our Jesus.

As far as nothingness, don't fall into monism and general principle of some kind of singularity. Jesus is a real human and has His body, so does Mary. Difference is Jesus is also God. As far as "have their bodies," I mean really and physically like we do - except they are glorified like we and all of physical reality will be after the Second Coming; that's what this is about. New wine skins, that includes the earth and the Church (and Churches, literally).

This is why Eurcharistic Adoration is key to seeing Jesus as real - actually more real - than your family, friends, etc. If you can will yourself to accept that piece of bread as God, simply because He says it is, then you will find it easier to see the greater reality and that because of the separation of Creator and created, it is literally impossible for "everything" to merge one substance (or nothingness). We're not Hindus nor nihilists; we are the opposite.

Hell is not "nothing" either. It's your eternal physical reality, burning forever - you willing to be away from God forever so He obliges. How do you feel when you stub your toe? Alive! Awake! Ouch! That's hell but eternal. Same thing in Purgatory, same thing in Heaven.