The ProQuest searchable historic newspaper databases (which
includes searchable texts of Boston Globe, Los Angeles Times,
New York Times, Chicago Daily Tribune, and Washington Post) returns
194 hits for a search on Albion W. Tourgee. Some of these articles
include texts of Tourgee's speeches and lectures. One article
mentions his daughter's close friendship with the daughter of
George W. Cable. As to his religious ties, one article written
shortly after his death states:
"In 1881, with others he started Our Continent, a weekly magazine,
and he continued as its editor until 1884, when it was absorbed
by the Christian at Work, to which journal Mr. Tourgee went to take
charge of one of the departments." (Boston Daily Globe, May 22,
1905), p. 7.
I find no articles in this database which put Tourgee and Twain
together in the same room.