We're all on our way to sure death. Once you see your scenario in place, all the restrictions around if will be gradually removed and then the choice taken away from the patient; the choice will be made for them.
You'll need to convince God that a person has the right to choose their moment of death and that murdering someone is OK.
The only person who has to convince God is a person who believes in God. There are many religions and many very religious people who are not Christians. Everyone has to make their peace with their own religious beliefs on this matter. It is your right to judge them for their choice, and it is their right to do what is right for them despite what you think. That’s what makes this country great. Right?