Jose:
First, the CM does have religious background, and, seemingly, a particular religious background at that. Second--and this is directed at hannahjoy's comment below--the biblical CM is woven into our culture pretty deeply. We can refer to it without even mentioning it by name.
However, the Creation Model itself is based upon religion. It is not a generic model that fits with all religions, but is specific to a relative few. As I see it, if we attempt to eliminate all bias toward any particular religion, and thus teach creationism in a religiously-neutral way, then we will have only a very small statement to make: "maybe, instead of natural processes, a supernatural being created everything." If we invoke timing of the creation event, or locations of events, or the Flood, we necessarily invoke a particular religious viewpoint. [I might summarize this by saying that I've been attempting to show (perhaps with limited success) that creationism is, by definition, religious interpretation.]
Also, it was touched upon in the Judge: Evolution stickers unconstitutional thread.
bernee51:
What is the original (only?) source of the christian creation theory?
What is the supposed word of god?
What is the basis of the christian religion?
Yep - the bible.
The remaining question - is it a religious or scientific text?
Seems to me to be pretty well religious, but YMMV.
So, for discussion:
Should creationism not be allowed to be taught as a science in public schools because of its religious overtones?