well first off. the mentaly handicapped i belive are covered in the verse when christ said forbid not the little children to come unto me. i belive in gods eyes the mentaly handicapped are the same as children. they have the same mentality level. and with the gluttony thing,,,, glutony a sin of willingness. the bible also says he that Knoweth to do right and doeth it not to him it is sin. i dont think that you could place any genetic disfunction under sin except in the context of everything being perfect before sin entered the world. genetic disfunctions are a result of sin but not a sin in and of themselves. the bible makes it very plain that god loves the people that society casts out. in one of gods parables the good man of the house (symbolizing God) tells his servant to go invite a bunch of good people to a feast he had prepared. well they all found excuses not to come so the man sent his servant out and commanded him to go to the high ways and bye ways and find the weak and the maim and the halt and comppel them to come in that his house may be full. well that proves Gods love for the outcasts. but there is more meaning to this verse then that. in the parable the servant would be us the saved people who are trying to do Gods will. so we should be the ones going out and finding these people and bringing them in that Gods house (the church ) may be full.
S.S