But for starters, how can this author make the following statement without some serious back up documentation, proving this or at the very least lending serious weight to the contention:
Erasmus was a Renaissance rationalist who placed reason above Scripture. Therefore the truth of Scripture was not that important to him.
If this is elaborated on further on in the piece, please disregard the question.
Historically most of those in the Church were Renaissance rationalists. I believe the author is correct in his assertion and this is even verified by the Catholic website newadvent.com. Below is a very small excerpt about the life of Erasmus.