So you want to gut the story while preserving it's value? What value remains if it is stripped of its essence? What you call objectionable messages and religious preachiness are the cornerstones of the series, not necessarily negative but vilified and shamed by you in an effort to cultivate the trendy fad of whatever es for the moral high ground these days.

"Flexible casting"......? Cool, so if we're not concerned with historical accuracy or even faithfulness to source material, if they make a movie about Rosa Parks can we see if Meryl Streep is available?