That's great," whatever gets him and you through the night- is alright...". If we believe the Bible we know it does not require great knowledge to be accepted by God. Jesus said about those having the faith of a child .
http://www.openbible.info/topics/faith_of_a_child
If your father is happy and you are able to watch over him a bit, then I am very happy for you both. As far as faith healing, don't expect it. I know there are folks who swear it has happened but just deal with your dad as he is and support him.