which religion did he convert to?
Judaism
Lord George Gordon
In 1787, at the age of 36, Lord George Gordon converted to Judaism in Birmingham, and underwent brit milah (ritual circumcision, circumcision was rare in the England of his day) at the synagogue in Severn Street now next door to Singers Hill Synagogue. 
where did the trial of lord george gordon happen? Court of King's Bench when did it happen? 5 February 1781 why was he on trial? High treason; Gordon's role in the eponymously named riots where is the court located? England can you name some of its official? Chief Baron of the Exchequer was it ever dissolved? Yes, the King's Bench ceased to exist who were the barristers on the lord's side in the trial? Defended by Thomas Erskine and Lloyd Kenyon, Gordon was accidentally assisted by the Attorney General, James Wallace did he have a parliamentary profession? Yes, at the 1774 general election Gordon was returned unopposed as Member of Parliament for Ludgershall
wiki:13072113
Lord George Gordon [SEP] Conversion to Judaism
In 1787, at the age of 36, Lord George Gordon converted to Judaism in Birmingham, and underwent brit milah (ritual circumcision, circumcision was rare in the England of his day) at the synagogue in Severn Street now next door to Singers Hill Synagogue. He took the name of Yisrael bar Avraham Gordon ("Israel son of Abraham" Gordon—since Judaism regards a convert as the spiritual "son" of the Biblical Abraham). Gordon thus became what Judaism regards as, and Jews call, a ""Ger Tsedek""—a righteous convert. Not much is known about his life as a Jew in Birmingham, but the "Bristol Journal" of 15 December 1787 reported that Gordon had been living in Birmingham since August 1786: He lived with a Jewish woman in the Froggery, a marshy area now under New Street station.