Beyond the theme of one has to have faith of the history Idea.....you bring up a good point IMO. It would be very hard to try and be objective if someone that does not believe does a study on religion or if a person that does believe does a study on religion. I would think that no matter how objective you are, you would still tend to lean to one side on the topic and or research. Now I would also think that there might be those few that once doing the research and speaking with people that they may even change their view point 100% and become what they were not in the start. Say an aethiest becomes christian, or a christain becomes aethiest....but I would imagine the majority of the time a non believer will have a slant to his research, just as a believer will have a slant to his. I think that would be just natural. So many of these articles used, pro or con, have to be taken with that in mind.