Gentiles (except for Noahides) are not pro-Torah. If they forbid the Islamic fast, they would very likely forbid Judaism and Noahidism firstly!!!!!
Most Gentiles are either Christian or Secular, so in case they decide to rule on privacy, they'll care much more about a Jew circumcising his baby or rejecting pork (something they don't understand since it's not a Christian concept) than about a month of fast!!!!! Seculars can undertand the meaning of a fast, but they are unable to unerstand the reason for a Bris. They see it as bardaric!!!! And they consider Kashrut as an old fashionable irrational superstition. Again be very carefull!!!!! Don't advocate those powers to Gentiles!!!!