Some of this stuff has been privately percolating since the late sixties and early seventies—once, that is, that at least a few horrified people began pursuing the consequences of the hard evidence that the order to allow the Israeli attack on the USS Liberty to continue without response came from LBJ himself. Of course, there had been people in Texas who knew far better and far sooner what the score was, but calling out Jews as ipso facto disloyal was almost as much of a no-no then as it is now.
I believe that I first read material to precisely the effect your quoted matter lays out—whether in an actual article or in comments upon an article I fail to recall offhand—at The Occidental Observer, Kevin McDonald's site, fully five years ago. Whether Johnson was a true Christophobe in his blood and bones or simply played one for public consumption hardly matters, however. He always had big Jewish money in his corner, from the very start of his corrupt career in Texas down to his arrival at the White House door. In short, he was a criminal who, unlike many others, not only was bought but stayed bought!