During the month of Ramadan fasting is compulsary for every adult muslim.
when do Muslims know when to start and stop fasting
Christians do not have a fasting month, only Muslims do.
shadan
Ramadhan
The holy month of Fasting on the Islamic calender is called "Ramadan"
Ramadan. The five pillars (for Sunni Muslims) include fasting, and Ramadan is the time of fasting. Shia Muslims have fasting as one of their practices rather than a pillar of faith.
from the age of puberty.
doing fasting
Muslims stop fasting when they can see the new moon that is the first day of next Islamic calendar month.
Yes Muslims can spit when fasting! I have!
From sunrise to sunset. This time varies with location and time of year. For example, fasting during winter is shorter than fasting during summer. Also, fasting near the equator is shorter than fasting near the poles. At extreme latitudes, sunrise and sunset can be months apart; it is impossible to fast for that long. Muslims use different estimations for prayer and fasting times at such places. Some fast for more than 20 hours.
The Muslims fast every year during the month of Ramazan. It is called Soam in Arabic, Roza in Urdu.