“heat can alter enzymes:”
Please state which enzymes require for our health are destroyed by pasteurization of milk.
I don't know; I'm not a bio-chemist, nor do I care enough to find out — your assertion was that pasteurization didn't alter the enzymes, I showed that it's at least theoretically possible it could.
What I do know from experience is that both me and my friend's bodies treat raw-milk differently than that of processed (pasteurized/homogenized) and that it's not uncommon — supported by (a) my great-grandfather's observation of children's health when it was switched, and (b) most people who have consumed both raw and processed milk, and (c) some people can handle live-culture yogurt while not being able to handle pasteurized (sterilized).