Having just "done" a wedding yesterday, I made sure that I spoke to the Reverand prior to the day. Here in the UK most religious marriage ceremonies follow the same etiquette - photos at any time APART from during the service!! This point was emphasised!! Also, when the newly weds sign the register - NO photos can be taken. But it is okay to "mock" a signing by using a blank page in the register and have the bride/groom holding a pen! If in doubt - ask the person presiding over the ceremony!