Well, that leaves the creationist position with absolutely no arguments, then. What exactly is the creationist position then, and exactly what arguments does it use to try to debunk one of the most fundamental and solid theories in the biological sciences?
You base this on what?
"What exactly is the creationist position then"
There are two more-or-less cores to the creationist position:
(1) Multiple roots to the phylogenic tree (a polyphyletic tree instead of a monophyletic tree)
(2) A massive flood wiped out most life several thousand years ago
A summary of some of the points of evidence is here.