Manga is simply a form for presenting stories. It can present any type of story someone might write. From Romantic tragedies to sports stories, or historical narratives to supernatural horror stories. It is all there.
The porn is there too, just as it is with novels or magazines. And, with the decadence of American society, there is likely porn consumption in all media. That does not make any of the media inherently bad. It is the prurient material which is the problem.
Yes... my question is why not gospel manga?
It may be quite true that manga is simply a form for presenting stories, as you said. However, in order to experience the stories, you actually have to *watch* it. And the artwork is so mind-stunningly bad, the cartoons so amateurishly animated, that watching it is utterly impossible.
Given a choice between watching manga or a My Little Pony marathon, I think I’d get rid of the TV...