"When we die, our bodies cease to be "us," as our souls separate from our bodies. Then the body becomes worm food. It's a simple fact of nature."
Please show me anywhere in the Bible where a dead person's body "ceases to be us." The spirit separates from the body yes...but the body still belongs to that individual. This is why throughout the bible, burial is honored (explicitly starting with Abraham), and bodies are not just cast off as food for ravens.
Christianity has never taught that a human body is irrelevant...mainly due to the resurrection. Christianity has also never taught though, that should the body be lost...due to decomposition, or explosion, cremation or whatever that they won't be resurrected. God the Creator would have no problem reconstituting the dust or ashes we become into a new body--of the same type of Jesus's after His resurrection.
At the same time however, until the 20th Century, there has been no tradition of cremation, (originally a pagan practice, by those who devalued the body) as the body, even dead, does matter...and is understood as being resurrected some day.
I'm not aware of anything in the Bible that says anything about that one way or another. Have you ever been to a wake and viewed the body? It's an empty shell. That person no longer occupies that body. If the Bible contradicts me, I will defer to it. :-)
Jesus said that God is spirit. And considering what we know about consciousness, resurrecting that would make the body unnecessary. Interestingly, John Paul II didn't seem the least concerned about the preservation of his body.