"You still mis-define Charlatan."- Anastasia
No he doesn't.
charlatan noun
2 : one making usually showy pretenses to knowledge or ability - Merriam-Webster online dictionary
Pastor Russell wrote thousands of articles, magazines, books, tracts, etc., etc., in order to bring to 'ignorant mankind' his amalgamated and contrived version of biblical truth so as to point them to the way of salvation as he saw it. His sincerity does not preclude him being a charlatan.