Ok, this isn't anything new, but...
Many Christians argue that the Bible is the ultimate source of morality, and that there can be no other source for it (especially not in secularism). Yet they are completely unable to see how it's precisely secular morality that mandates how the "morality" in the Bible is interpreted.
How the Bible is interpreted is very much influenced by the contemporary cultural norms (I think the technical word for this is "zeitgeist", although using that word has become a curseword because of the idiotic conspiracy theory "documentary" named like that). For instance, some hundreds of years ago most Christians didn't have any problem in interpreting eg. slavery laws in the Bible quite literally. Nowadays, however, they bend over backwards trying to mitigate and whitewash those laws by arguing how they are not that bad, they don't really mean what they seem to be saying, and so on. (You wouldn't believe how contrived the discussion about this can get. Ok, you probably can; it's just an expression.)
Clearly, it's secular morality and the concept of basic human rights that's dictating how (most) Christians interpret the Bible. But after these Christians have gone to ridiculous lengths to try to twist the Bible to conform to these secular morality standards, they then invert the whole causality chain and start claiming that it's the Bible that's the source of these moral standards (and that the generally accepted human rights and moral standards are influenced by the Bible rather than the other way around).
When you point out to them that interpreting those exact same passages was different in past centuries, they will simply argue that those were wrong interpretations. They are so close to admitting that it's the cultural zeitgeist and contemporary secular morality that's affecting how the Bible is interpreted, but they just can't (or outright refuse to) see it. They will maintain to their deaths that the direction is reversed, that it's really the Bible that's the source of morality and that all morality is based on it, and that atheism and secularism has no moral standards of its own. It can be really exasperating.