I think the one thing you need to do is give the key back - you can’t have a key for a house of someone who is capable of suspecting you of thievery. Not for him, and not for you.
I think this is an important part here. Theoretically, my father is also not all bad since my mother loves him, as do my three brothers apparently. However, not only was he the wrong dad for me, I was the wrong sister/daughter/cousin for my whole family. They all made my life miserable trying to force me into their narrow idea of “right” until I finally just left, physically and emotionally.
I haven’t talked to any of them in years due to lack of interest, which won’t work for you, but it may help to realize that you are never going to be the person that fits into whatever slot your father thinks you should, and that there is nothing wrong with that. If you want to go back to making him dinners, look at it as delivering to some semi stranger ala Meals On Wheels. If he starts getting on you about being the devil, look at it with mild amusement, as you would any street corner preacher. He’s not going to change, but you can change how you view him and whether or not he upsets you. It takes practice, but it can be done!