From Sefer Ha-Hayim:
I received some online and offline comments about the title of a recent post on Hirhurim, the origin of which is in the Christian bible.
R. Yehuda Henkin has an interesting teshuvah (#26) in volume 4 of Bnei Banim on the subject of whether those who believe that the Lubavitcher Rebbe is the messiah are considered to be heretics... (continued here)