Issue the same veto to a Westphalian and he will be tempted to fight you. Abstinence from wine is a good religious precept in Arabia where orange water, lemon water, lime water are necessary to health. Mohammed would not have forbidden wine in Switzerland perhaps, especially before going to battle. There are customs of pure fantasy. Cambyses who treated them as they deserved, they and their bull Apis, Cambyses' courtiers, Cambyses' soldiers, had not had their prepuces lopped, and were very well.
Climate does nothing to a priest's genitals.
One offered one's prepuce to Isis, probably as one presented everywhere the first fruits of the earth. It was offering the first fruits of life. One could as easily make a dogma accepted on the equator as the polar circle. It would later be rejected equally at Batavia and in the Orkneys, while it would be maintained unguibus et rostro at Salamanca. That depends in no way on the soil and the atmosphere, but solely on opinion, that fickle queen of the world.