After a body is buried and when it reaches a point when it has been buried so long that all of it has completely decomposed and there is nothing left, can it still be resurrected?
Most Christians do not want to be cremated, they want to be buried because they think that the body needs to be preserved for the resurrection.
But, is this necessary? After a body has been in the ground long enough, it does not matter how well you tried to preserve it, it turns to dust and is like or goes back to being "dirt" essentially eventually. Why try to preserve it, it just a shell, the spirit within you being or becoming an everlasting spirit is what really matters for resurrection, not the body. It is vanity to try to make your body last as long as it can after death and shows a lack of faith in God to me. God can create or make manifest a body out of nothing can't he?, if he has a spirit to put in it that is... right?
When Lazarus was resurrected, he had decomposed some and many knew he must stink, but, did he come back stinking or partially decomposed like a zombie? I don't think so. I don't think he did. The bodies that were resurrected at Jesus death from the memorial tombs were not like zombies either, they were not resurrected being partially decomposed.
So, it doesn't even matter if there is nothing at all left of the Body, God can give you a new one out of nothing if he wishes...
God Bless!