I wouldn’t but I think the motivation is clearly Jesus referencing them. “Jesus said it” is enough for most Christians. Of course, the assumption is that Jesus actually said what the writer ascribes to him and in that context. Most Christians tend to affirm this as well but in some cases this is a disputable point. But either way, most Christians would feel extremely uncomfortable correcting Jesus on any issue. Its true Jesus was not commenting on creation but rather the issue of divorce. None the less he references a story accepted as true at the time. I don’t think a proper historical-critical method presents us with an omniscient Jesus who knew the story was false but rolled with it anyway to accommodate his hearers. Conservatives are probably correct to reject such liberal back-peddling. His whole life Jesus would have learned about this story most likely accepted it as true like everyone else. His references to the Old Testament give us little reason to think otherwise.
Personally, I think the humanity of Jesus only gets paid lip service in much of the Church but as a Christian I can certainly appreciate those of faith who defer to Lord on this matter. For them, Jesus is a better source of knowledge than man-made science. Its an issue of trusting God over man to them. I think that is a major stumbling block and I don’t think Old Earth creationists and evolutionary creationists (or whatever they deem themselves) address the issue adequately. I do not think bopping young earthers on the head with actual science will be very effective overall until an alternative view of scripture they can accept is presented. Many of them do not have scientific backgrounds. They do have backgrounds in Biblical interpretation, however. They trust the Bible and they trust Jesus. Ergo this thread. I would like to see some rational explanations and diverse points of view on the issue. One thing I feel I have noticed on this forum is that often times we go round and round and round on many issues but a proper exegesis of scripture is often neglected. I think providing an alternative and proper hermenueitc could be a better path. In addition, I think greater focus on the human side of Jesus (doubt in the Garden, passages showing his lack of omniscience or that he actually had to learn) might serve us well.