Always work with the clergyperson and respect the ceremony, congregation rules, the ceremony's spiritual nature, and act and look professional at all times. In the long run this helps your videography business as the clergyperson could refer other clientele your way.
It takes less space and is easier to capture clips one at a time than taking one long video clip with the plans to break it up and edit later. Nonlinear editing allows you random-access capability so you have the ability to change the sequence of your shoot once it is on your hard drive.