Pay no attention to Mr. Rippon who cannot seem to understand that Paul spoke to new Christians as if "men of flesh" because the new Christians could not understand spiritual meat. Note that in his (Calvinist) view of the verse it reads "...does not accept [all] the things that come from the Spirit of God...." Others, based on context, understand the verse to say "... does not accept [some] things [i.e. spiritual meat] that come from the Spirit of God...."
Returning to topic, the best defense of the Bible is to redirect the discussion to what the opponents of the Bible believe about Christ.
Unless/Until the Spirit enables sinners to see and perceive, ALL things spiritual to them would be hitting deaf ears!