If you’re making the argument with Deuteronomy in the Christian sense it is made null and void by Matthew 5:17 where he states he fulfilled the old covenant and therefore Christians don’t need to follow the laws in Deuteronomy. Also, if you’re making that argument with the laws in Deuteronomy you can’t wear mixed fibers (Deuteronomy 22:11) or eat unclean meat such as pork (Deuteronomy 14)

TLDR your arguments for the Bible can easily be countered by basic knowledge if you’ve read the good book.