Welcome to the forum.
All i can add is that CT Russell prophesied that Christ had invisibly returned in heaven in 1874 and that Armageddon was going to happen in 1914, now does that make him a prophet?
As for looking into other faiths, Russell was assistant editor to the Adventist magazine. He was part of the Millerite Adventist movement,which has an influence on his biblical prophesying. If you look at all the religions who have come from the Millerites.....Seventh Day Adventists, JW's, Christadelphians.....they all have date setting and last day prophesying in common.
As for the early JW founders religion, if you look into their history they weren't religious, they were bible students who debated and Russell published the Watchtower magazine. It was Judge Rutherford who played the part in organising it into the religion we see today, which ocurred during the 1920's and 1930's.
Paul