“but popularised and mythologised to promote Christianity and sales of the bible.”
Certainly not to promote sales. In the Middle Ages ordinary Joes were forbidden to read it!
According to the Council of Toulouse …..
“We prohibit also that the laity should be permitted to have the books of the Old and New Testaments; unless anyone from the motives of devotion should wish to have the Psalter or the Breviary for divine offices or the hours of the blessed Virgin; but we most strictly forbid their having any translation of these books”.