I am actually not claiming that creationism isn't possible. Rather, creationism cannot be proven nor disproven. It cannot be observed nor measured. If it is accepted, it is done so on faith, absent any concrete evidence, and is based on traditions that have been handed down to us by previous generations. Some people accept that faith, others do not. That is a personal choice.
Science deals with what is observable and measurable and compiles concrete evidence to describe the world around us. Let science deal with the observable and measurable. Let religion deal with that which is taken on faith. Religion and faith do not belong in the science classroom.
Science has not yet been able to describe everything in the world. Science is very open about that fact. But that does not justify bringing faith into a science class and pretending that it too is science, or that faith can be accepted scientifically. Again, that is ignorant.
Recognize it for what it is. Religion deals with faith, and it has an appropriate place in society and in the educational system. But that place is not in the science classroom.
I really have no problem with a teacher, in the context of a religion or theology class, suggesting to the students that the aspects of our existence that cannot (yet) be described by science can be seen within the faith as a guiding act of god/zeus/odin/mother goddess, etc. As science fills in the gaps, then it becomes appropriate to adjust the faith to accept what can be scientifically described and for which there is abundant evidence.
However, there is a very big problem with a teacher, in the context of a science class, telling the students that the gaps in scientific understanding should be viewed as the hand of god at work. That is a leap of faith, it is not measurable or observable, and there is no evidence to support it. So in the context of a science class, where observation, measurement, and evidence are of paramount importance and cannot be applied to faith, it is absolutely inappropriate to bring faith into the mix and couch it as scientifically plausible.
This is really a very simple concept. I am bewildered why this is so difficult to grasp.