I can't speak for the "reuse" of atoms on a continual basis as if that's the way it goes and went, but now the question arises -- if that is true, then the atoms would have had to be here without creation forever, in other words, without beginning. And that, my friend, would not make sense, but then I'm not the creator, and I'm not God, I am only saying what I understand now. To recap, God knows everything about each one of us. However He does it, He can restore life -- we will know ourselves upon resurrection. Do I understand it all, of course not, I only know it makes sense to me that we would be resurrected as ourselves. And not someone else.
Take care, and have a nice day. (really)