The way the Jewish calendar is arranged (the fixed calendar by Hillel II, as mentioned upthread), Yom Kippur can never fall on Saturday night/Sunday (nor can it fall on Friday). That situation can only occur when the new-moon-by-witness-testimony rules are restored, after the Messiah comes and re-establishes the halachic court system.
Yom Kippur itself is a day of fasting, the festive Yom Kippur meal is eaten the day before the fast. So in the event that Yom Kippur were to fall on a Sunday (given the above circumstance), the Sabbath meal would double as the festive pre-Yom Kippur meal.
Not sure what you’re talking about here…if Yom Kippur would be immediately after the Sabbath, why would you have to do any special food prep while fasting?
There’s something called a “break-the-fast,” but it’s a light meal at the end of the YK service. The idea being that you shouldn’t stuff yourself after a long fast. And it’s usually a dairy meal, so there will often be fish. BTW, the Yom Kippur fast is for approximately 25 hours, and you abstain from food AND water. Of course, if there are health issues, you don’t have to fast. My husband was type 1 diabetic so he didn’t fast.
?? If even 0.5% of the world’s population subscribe to Jewish dogma, colour me surprised. Maybe about 99.8% or 99.9% don’t? It’s not a really popular religion.
That said, nobody is forcing anybody to care about the Jewish Sabbath. Presumably those who do actually believe in the religion and enjoy conforming to the restrictions; it’s not a burden they are looking to shake off or find ways around.
Further, unlike Christianity or Islam, Judaism is not a proselytizing religion (doubtless this is part of the reason why its numbers are so small). If you tell a rabbi “Why would anyone want to be bound by all of these rules?”, he’ll answer “I know, right?”. While it is possible to convert to Judaism, it’s actively discouraged.