DNA is physical. The human body is physical. But we are not. We existed before we was born on Earth, and we will continue to exist after our physical human bodies die. We are only using it. We will leave it after it is no longer usable. So we are not physical. Therefore physical things cannot disconnect us from God. Probably nothing can. Except everyone's own will. People need to willingly turn away from God to do that. People can do that, because God gave free will to everyone. So if you choose God, no one and nothing can disconnect you from God.