The best place to start when discussing creationism is probably discussing why people hold these beliefs. Creationists don't believe that god created the universe out of nothing, or that the earth is only 6-10,000 years old for any reason founded in science. The reasons behind their belief are purely religious. Many creationists the have the gall to suggest that evolution is a religion.
Lets start with some basic definitions.
1. a set of beliefs concerning the cause, nature, and purpose of the universe, esp. when considered as the creation of a superhuman agency or agencies, usually involving devotional and ritual observances, and often containing a moral code governing the conduct of human affairs.
2. a specific fundamental set of beliefs and practices generally agreed upon by a number of persons or sects: the Christian religion; the Buddhist religion.
3. the body of persons adhering to a particular set of beliefs and practices: a world council of religions.
Evolution doesn't follow these definitions, and the only conclusion that can logically follow that is that evolution is NOT a religion.
Besides definitions, the core difference between creationism and evolution is evidence.
Evolution is an evidence based science. We have fossils that show common descent, we have genetics that show common descent, and this evidence is very substantial, it is not merely a few pieces here and there.
Creationism on the other hand is founded on principles from the bible. This does not constitute evidence in any way. A book written mostly in the bronze age, by men who knew absolutely nothing about science. A book that has been shown to be wholly unreliable on historical and scientific matters, and riddled with contradictions. 90% of the 'evidence' that creationists postulate has either already been refuted or is not in fact evidence at all. What I mean by not being evidence at all is that it is rather an absence of evidence, Creationists look for holes in current scientific understanding (evolution in particular) and then claim, "You can't explain this, therefore god exists" (might I add, it should be "we can't explain this yet"). This is known as the 'god of the gaps' theory.
The proponents of the 'god of the gaps' idealogy are intellectually bankrupt and dishonest. There is nothing scientific about glorifying ignorance and abandoning reason and then claim that it is more scientific that its very well established arch-nemesis evolution.
There is no reason to believe in biblical creationism. There is no scientific evidence that supports it, and the bible itself is nothing to be relied on, except by blind faith.
To be continued...