This is he, yes?
http://en.wikipedia.org/wiki/Judah_ben_Samuel_of_Regensburg
It looks as though it just may be.
the personal relation of the individual to God, which at times was in opposition to the religion of the Synagogue.
indulged in marked departures from the accepted religious practises.
emphasized the importance of studying the Bible as against studying the Talmud.
Sounds a little like Christ!!