Lactose tolerance is the mutation.
Lactose intolerance is the normal biological system.
"However, certain human populations have undergone a mutation on chromosome 2 which results in a bypass of the common shutdown in lactase production, allowing members of these populations to continue consumption of fresh milk and other milk products throughout their lives."
http://www.reference.com/browse/wiki/Lactose_intolerance
Lactose tolerance is just a normal 'loss-of-function' mutation. Nothing supporting evolution here.
I don't think so. Mother's milk is lactose rich. The ability to metabolize the sugar is innate. Look at the computation example for E. Coli. It is in my post 79.
Tell yourself whatever you need to tell yourself to believe whatever it is you feel called on to believe.