There is a man, not an am ha'aretz by any means nor a Tinok Shenishba who has become an Apikores by any definition. He is not evangelical about his unbelief and is observant. He does not publicly violate the Sabbath, but has privately expressed doubt to others regarding belief in God and other fundamentals of Judaism.
How such a man is to be treated in Halacha, e.g., what is the status of wine he touches?