For the preaching of the cross is to them that perish foolishness; but unto us which are saved it is the power of God. (1 Corinthians 1:18 KJV)
We can struggle to make it as rational as possible, but in the absence of the work of the Holy Spirit, we are not going to convince anyone that what we are preaching is anything other than nonsense.
People may try to use Henry Morris as an excuse not to believe in Christ, but that ain't gonna fly. Especially if we someday find out that Henry Morris was right.
The foolishness is because of a defect in the hearers, not in the speakers. The gospel is quite rational to rational people. Unfortunately, the unsaved are by definition irrational. Thus the rational gospel is foolishness to their (dead) ears.
Let's not loose track of your initial suggestion.
Since when did Christians like DeMar take it upon themselves to do the work of the Holy Spirit?
By this statement you were clearly insinuating that gibberish could come out of ones mouth and they would be preaching the gospel according to the will of God, since all one needs to believe is the Holy Spirit.
The wise crack backfired.