their main argument is: they haven't found transitional forms.
but if "science" hasn't found transitional forms what is this? not enough? well then check this list of transitional fossils.
i mean i know where they come from... their argument is: when "science" can't provide a full fossil record of every single mutation that ever happened then "science" must be wrong about evolution... which is a bit retarded because you'd probably have to dig through all the landmasses of the world and in the seas to provide that evidence and even then it probably wouldn't be possible because most of the land living creatures decompose fully after millions of years when they haven't been trapped in some swamp or god knows where. in addition creationists can't provide one single shred of evidence that god exists or that moses and those other biblical figures (jesus included) ever existed.