There is no one correct method, but you should care that your questions don't imply or include a particular answer. Set aside some time as soon as you leave the temple or mosque to write as full and extensive an account as you can of your visit, recording what you saw, what impressed you, what puzzled you, and what you learned. Be as descriptive as your boldest prose will stretch. The more extensive your daily digest of field notes, the easier it will be to write up a final report. Take photographs if you have a camera.
Slides are most verstile, so take at least some slides.
We will buy the film and processing for those photos that pertain to the Project. If you photograph each temple or mosque, each meditation center or gurudwara, just once from the outside, we will have quite a collection. Don't be deterred by the fact that many of the buildings may be plain and uninteresting from the outside. A mosque in a former one story office building is also important. If you take any interior photographs, which would also be wonderful, be certain to ask first if it is acceptable.