It's dumb, outdated, and silly, AND you're letting your rational thinking get in the way. The Coptic Orthodox church fasts for 50 days (to prove they're better than Jesus) and the fasting is eating vegan. I have a number of relatives that do it. Two of my aunts are fasting almost every time we see them (occasionally they come in from out of town) because the Coptic church fasts several times throughout the year. That's why the people in that church are absolute carnivores the times of the year when they're not fasting. Even when I was a Christian I didn't fast. It's all so stupid.