Without error in any part
This does not follow. The argument is faulty. A lie is to intentionally deceive people. God is even reported in scripture as doing exactly this (putting a lying spirit into the prophets), but even if we disregard this (and other seemingly conflicting statements such as "he is not a man that he could repent" / "God repented..."), if God lovingly and truthfully intended bronze-age authors to write down his words as they could understand it, this doesn't include that he had to give them supernatural understanding of history, geography, biology or other such thing in an absolute manner that confirms to the facts of science at every point in human history. Grudem is evading the real issues - or doesn't see them since his view of "flat scripture" doesn't allow perceiving the issues.