FTS, enjoy your conference. Hearing the serious thinkers in the field of late classical knowledge is a joy. I heard a lecture last week from the academic Karen Armstrong, (she is extremely well informed and assiduous in presenting an accurate picture but still, I believe, leans towards a deist interpretation). I agree heartily on the matter of JW mistrust of proper disinterested scholars, they are the ones at the coal-face of reality not "Bible scholars" who have only one object in mind. To understand the true birth of christianity demands a knowledge of contemporary life and thought which involves knowledge of the many sects and pagan beliefs. Manicheanism was an important ingredient as was the big cover-up you mentioned once Roman Christianity had gained ascendancy. Have you early textual references for this (cover up)?
I will read up on Sam Lieu's work.