This animal has done nothing to you, except live in your barn rent free. Take hime on a long drive up to the mountains and set him free. But first, take it to a vet who specializes in wild animals just to make sure it is healthy, and free of rabies. He/she has a right to live, just as much as you do. If he/she comes back, then leave it be. All it wants is a safe warm place to live.