chitlins is the shortened (probably Black, certainly southern) form of chitterlings, hog intestines prepared as food. Fried, in fact.
True Romance Magazines are goopy love stories, the print equivalent of soap operas, and they appeal to the same audience that likes gothic romance novels of the heaving bosom sort.
I don't know what bungalow colonies are without some context to go on--guessing, I'd say it was a term for a blue collar suburb.
I don't know what lunch-counter Protestants are without some context. Guessing again, I'd bet it had to do with people whose faith was more evident by their lunch-counter conversation than by their attendance at Sunday worship--in other words, people who are loudly sure what God thinks without checking out their presuppositions with a dose of exposure to what God thinks. But please don't overlook my "guessing" preface.