The Bones of a decayed dead person is still a Human being, and that is one of the reasons that many of us respect the dead which is buried in the ground. Being Human doesn't end at death.
I agree with you there. But, DNA is still there in the bones, even say, many years later in the case of identifying the dead's DNA in a case of earlier crime committed, and the likes. The DNA, correct me if I'm wrong, is the same as when the sperm and egg are united, and begins developing.
Mikey, I'm sorry, but your argument has nothing under it but emotion.
Scientifically, it's ridiculous to claim personhood before the (human-characteristic) brainwaves are running -- maybe a little before; animals seem to have selves with a "lesser" set of brainwaves, so a self could be present with an incomplete human set, I presume.
And the Bible doesn't say it's a person at conception, either -- just that at some point in the womb the unborn is a person.
Nor did the ancient Fathers agree on the topic -- many went with "quickening", which as I recall is abut 120 days.
In short, what common sense says is true: bones with the remnants of a decaying body around them aren't a person. In Christian theology, the person is off with God as a spirit -- and if you want to be precise, that is not at that point a human person, because a human consists of "soul and body".
A comment on burials: I find the custom of sticking people in the ground in boxes that will, if all goes right, keep them from decaying for 400 years, disgusting and insulting. The scripture says we will return to the earth, and delaying that process seems a little like rebellion. It's also depriving the ground of nutrients.
As far as I'm concerned, what a graveyard should be is literally a memorial garden: a person's remains could be cremated or frozen in liquid nitrogen and then shattered or frozen then ground up, and then stirred in with fine bark dust or sawdust and yard waste, to become soil. This soil would go in the memorial garden in a location picked by the deceased or family, stirred into the existing soil or inserted in plugs, and on the wall would go a plaque: "Here in this garden are the mortal remains of X", or something like that... maybe add "Seek her in the roses", or something depending on where the remains went.
I'd call my system far more respectful of the people and the earth both than what we do now.