Could you please explain your disdain for Dan Barton and WallBuilders, perhaps with some examples, and we'll go from there.
Happily. First off, he's a shoddy and selective pseudo-historian. He's been caught several times previously using apocryphal quotations to support his claims about the founders. His "history" of the civil war is downright apalling in its ignorance and error, typically casting the south as "evil" while portraying Abe Lincoln, who is known to have varied between deism and atheism throughout his life but never Christianity, as a morally driven Christian hero. He glorifies radical reconstruction, which even Booker T. Washington condemned, and very selectively portrays the two factions of the time by downplaying the widely existant racism in the north. He wrote an article not too long ago "comparing" the reconstruction era political party platforms yet in reality he cherry-picked the racist sounding stuff from the Dems while willfully omitting the fact that the 1868 GOP platform explicitly said that blacks in the north should NOT be given voting rights like their southern counterparts. Those are just a few small examples of which I could give you dozens if you desire.
Second, he's a spewer of division who practices a latent form of bigotry that rears its ugly head from time to time. In the early 1990's Barton made a number of public appearances with Bo Gritz, aka David Duke's old runningmate. Since then he's begun spouting a very latent yet also very evident form of anti-catholic bigotry. I reviewed one of his recent Wallbuilders videos that was laced with loaded terminology and implications, essentially suggesting that the 17th century colonists to America were all fleeing persecution from church "heirarchy" (read: Rome) that supposedly derived extraneously from the "true" Bible. He makes the implication as a blanket statement for all the colonists when in fact it does not apply to any. The closest parallel was a single colony - massachusetts - that fled not from Rome or even the Anglicans as is commonly misrepresented, but rather out of a belief that they themselves were better than and more pure than the old churches, which they sought to reshape by example (and in some cases by force). Most of the other colonies were not of this nature and some were even officially Catholic (Maryland) and Anglican (Virginia).
Third, Barton is a flaming Democrat-style racial panderer. I have seen videos, heard eyewitness accounts, and read reports of him participating in cultish "apology" ceremonies in black churches on behalf of the Republican Party of Texas over slavery. It's run through a cult group called "Justice at the Gate" that has an unusually friendly relationship with the Republican Party of Texas through none other than Barton. One of the ceremonies singles out white participants in the audience and asks them to kneel before blacks in repentence. Another involves a bizarre ritual of "prayers" around an inanimate "slave kettle." If you did not know who its participants were you'd seriously think you were watching something out of the "white guilt" reparationist left.
Fourth, I've seen David Barton's political behavior in the Republican Party of Texas and find him to be a charlatan, fraud, and snake oil salesman on multiple counts. Mr. "Devout Christian" Barton participated in merciless underhanded smear campaigns during the last several state convention elections and disputes to consolidate his own political power. Last election his campaign handlers circulated photocopies of voting records with scurilous suggestions about his opponent under the name of a fake PAC that he pretended to have no affiliations with - something he would have gotten away with except for the fact that hidden files of the same documents were discovered on his webserver. During the convention he authored and distributed several letters to delegates loaded with outright false and slanderous information including one where he accused the opposition campaign of adding "personal injury lawyers" to their ticket. He has previously employed his weight as a (pseudo)historian to kill off modern rule and platform additions that he does not like by branding them as opposite of what the "founding fathers" wished when no reasonable relationship exists between the two.
Fifth, he has profitted immensely from his position in the Republican Party of Texas. Substantial portions of our state conventions are now used to promote Wallbuilders and his video and book sales - an opportunity not afforded to other organizations selling things. Segments from his videos are routinely shown on the main screen of the convention floor during floor activities, all with the hint that you can pick up your own (for a price, of course) at the Wallbuilder's booth prominently located front and center in the most visible location of the vendor's area. That sort of self-promotion through one's own position of power is brazen, shameless and IMHO outright immoral