Al-Hamdolellah that we have been blessed with completing Ramadan this year, and hope that our deeds are rewarded and our sins have been forgiven. Now back to the forum, I missed you guys the past 10 days.
Fasting is one of the four major acts of worship prescribed on mankind since the very beginning of time: prayer, fasting, charity, and pilgrimage.
The jews and christians have been prescribed all four but they changed and adjusted to suit their purposes. Lint is a skeletal remnant of fasting. The religion you might be referring to is "Al-Sabaa'" whose followers were called Sabe'oon, or Sabians in English: "[FONT=Verdana,Arial]
VERILY, those who have attained to faith [in this divine writ], as well as those who follow the Jewish faith, and the Christians, and the Sabians -all who believe in God and the Last Day and do righteous deeds-shall have their reward with their Sustainer; and no fear need they have, and neither shall they grieve." [2:62][/FONT] According to some scholars they were those who followed God's prescribed messages before Abraham received the full charge and message of Islam. According to the more weighty opinion amongst those Ibn Kathir mentioned, they are those who followed a line between Judaism and Christianity, basically followers of John the baptist.
It might be that or it might be one of a hundred red herrings that many doubt-seekers are throwing around simply to enjoy seeing doubt rise amongst those who are not fully knowledgable. It reminds of that athiest Bill Maher when he said "doubt is my commodity, that is my bread and butter." So be aware that there are those who make it their charge to create non-existing controversy or make outright lies, only to move on to the next. Don't waste your time nor others if the person doesn't even bother bringing a valid question or query.