1) BIOLOGY grew by the work of hundreds of thousands of career people painstakingly assembling information. They DO criticize and even overturn ideas that were previously accepted.
CREATIONISM grew by the work of about one percent
as many persons as Biology. They partly researched the findings of science....enough research to start running skirmishes against science with anyone who was willing to listen
... but not enough research to be respectable
as a system of knowledge.

2) BIOLOGY is very strict. Sloppy work is
a target for being exposed.
CREATIONISM, from what I've seen, RELIES on
sloppy work going undiscovered. Rather than
actually knowing BIOLOGY, they just argue with
someone who knows enough to know they should be
countered. Unfortunately, the CREATIONIST is not
looking for the truth, but only practicing the debating arts.