"Both have a plethora of subdivisions, but get generalised under the same topic head."
> Yes, a plethora of subdivisions in science, but that is of practical necessity. My discipline is neuroscience, and even a sub-discipline within neuroscience. That is simply because a researcher has to focus on a limited set of questions that can be practically answered by a single, well-equipped laboratory (with sufficient funding, no less!). Not sure what you mean by generalized under the same topic head. Just a quick gander at MedLine and you will see thousands of specialty journals, each dealing with a specific area of research. If you mean its all "science", sure thats true, but that simply refers to a common method of uncovering observable phenomena, common statistical methods and a generally common way to design experiments (even there, we have profound differences between the life sciences and the physical sciences). On another note, there is an active, if somewhat understated push within many scientific disciplines for a "grand unifying" theory, Im sure you are aware of this in Physics. But in Neuroscience, this has most recently been the collective effort to unravel the neural basis of consciousness, which includes scientists from the cognitive realm, animal and human researchers, imaging studies, neuroinformatics, information theory, computer modellers, etc etc.
In brief: We WANT to find out the answers. The religionists THINK they already have all the answers. This is why there will never be a unification of these two very different modes of information seeking.
Now, given the dvisions in Science, there really is no rational way to compare this to the "divisions" in religion. First, I am unaware of any bands of terrorists from the Physics department on the 6th floor plotting to bomb our biology labs on the 3rd floor..... Second, scientists, REGARDLESS of discipline, have mutual respect and admiration for our colleagues. Our divisions are not based on race, historical fights over land, sectarian divisions, bigotry and hatred as seen amongst Jews, Christians (catholics + protestants), Muslims, Hindus, Sikhs, etc etc. As for religion being generalized under the same topic head, again, I would have to disagree. They share a common "belief" in the supernatural, but thats about where the similarities end.