there is probably a good amount of truth here. because I have seen some of those Christian bands live, and while many have Christian lyrics and images, what they do is anything but Christian oftentimes.
It's like, "Christian" is the name of the record-company that'll take any band the other record-companies didn't want.
And for the contemporary "Christian" music audience, it seems many of them are fans of the various genera that one finds in music today, but they take issue with the secular nature of much of it, that "Christian" record-label that'll take anything, is like an excuse for them to enjoy the kinds of music they feel they can't listen to when it is produced in the secular sphere.
Getting back to the books, it's really just a natural result that Protestant books would storm the shelves. The standards within the Protestant world for who counts, or what one must do to count as an authority are virtually
nill; since they believe that all are saints, therefore everyone is one an authority at the same level and one can pick and choose among any Protestant whom they choose to focus on.
Because anyone can be taken as an authority, everyone does try make themselves into an authority. Because there's no litmus test in Protestant spheres, one's qualification can be little more than being able to charm middle-aged Protestant women.
In fact, when you look through a lot of those self-help books, what kind of message does one find? Does one find a message of Christianity, or one of moral code?
The fastest way to be seen as some kind of Christian icon to be emulated in Protestant spheres is to simply write a book which condemns whatever group it is popular to condemn at the time. People in Protestantism are already in a religion which grants that everyone has the possibility of being an authority, therefore pick and choose any authority you want. Consequently, individuals will use the Protestant ideology of following their Bible & their Conscience, which amounts to nothing more than following one's Conscience, because that is what is reading and interpreting the Bible for them.
The ultimate effect is that Protestant readers enter into a "Christian" bookshop with the intention of finding books by "Christian" authors who agree with them; this allows them to lend greater credibility to their view, because it is shared. Very rarely would they enter into such a shop to challenge themselves with books that argue for view opposed to their own, unless their own views are ambiguous enough that they suppose any view could be right.
Couple this with the fact that, there really isn't much to say in Protestantism. You joined the 700 club, sometimes you're baptized, and now you're "saved", and nothing at all to do with your own deeds.
So what's left? Except to await the Second Coming, or to talk about moral issues.
So Protestant books are not written to aid in an exploration of Christianity. Rather, they are written for niche audiences.
A book on traditional marriage for teens / young adults which argues that marriage must be done according to certain rules and then it's just a given that you'll be happy (all that conflict management and interpersonal blah, blah is just a conspiracy theory put out by Public Schools). The book doesn't care what the rules are, it'll just reiterate whatever views this individual's denom preaches, because the book is a niche for people who believe in that niche.
Many of them parallel secular tabloid magazines.
For women there'll be,
"10 steps to a Godly marriage" (11 steps is all heresy!) for young or old.
Perhaps for new moms,
"Raising your kids in God's House" (Was about to put Christ but it's not a given every Protestant believes that... - see, it's about niche, and marketing, you want
everyone in the niche to buy you're book).
What do most of these books have for content?
Well since the people who bought them didn't do it to be challenged but rather the have their current beliefs confirmed.... it's usually just 1st person accounts either by the author or a collection of people, and maybe some stories from... wherever, which are designed to confirm the beliefs.
Ironically, most of the time these books can only strengthen the reader's beliefs circumstantially. But it works, because the reader already wants to believe.
So when the author joined their Protestant hoopla, whatever, they talk about any good thing that happened to them, no matter how small, and read it as a sign intentionally sent from God to confirm that they'd made the right choice...even though the connection is only clear to those who want the connection to be present.
"As soon as I became a Lutheran, the Steeler's won the game, after a year-long loosing streak, I felt like there must be some significance to this, and then I realized it was God, sending me a sign!"
Or many they read significance into the number of points on a Maple leaf...
Ya'll have probably stopped reading by now....
Jupiter is a giant gas planet which, had it been several times larger, would've ignited to become a second sun. Blah, blah, cornflakes, blah....
We was a late-comer to be sure! But in the movies, he comes before some of the late-joiners who in the comcs preceded him! 
