A warm welcome Chevelle ! I think the start of "belief" was at least before 9,000 BCE, the finds in Turkey show that "belief", and if you like "organised religion", was already strong enough by that time to build Temples etc.
John Aquila Brown was no doubt as guilty as William Miller in influencing C.T.Russell, an Adventist, to proceed with his own version, highly plagiarised, of predictions. Russell learned nothing from "The Great Disappointment" of 1844/5, and proceeded to make the same mistake as Miller at least twice, following in his footsteps Boozer Rutherford did the same thing with 1925, and Mad Freddie Franz with 1975. JW org are Serial Offenders in Committing the religious Crime of False Prophecy !
Looking forward to hearing more from your good self !