"I know it is common knowledge that Darby was the originator of the rapture. I've read numerous "articles" about that but this is not true."
Are you talking about pre-tribulation rapture? or merely rapture in general?
What is the basis for pre-tribulation of the rapture?
I have not seen it, Darby and Scofield speculate regarding pre-tribulation rapture, I'm sure others speculated the same thing before them, so I do not doubt that they are merely the originators on the first written record.
As far as some so called Christians being lackadaisical as a result of the pre-tribulation belief, I have experienced first hand peoples indifference with the pre-tribulation rapture as an excuse for their lack of pro-activity. Not to say that there are those that are not active despite their belief of the pre-tribulation rapture, for I have met many who believe in it as well that are actively helping those in need. Enlighten me I don't get where this perspective comes from other than from speculation.