Wedding Photography lenses for mixed religion weddings can be complicated, if not more expensive. For those weddings where the different religions could just follow one after the other, the time frame would be shorter and the photographer could just shoot the pictures without having to worry about having to make another trip or schedule another time.
There are however, mixed weddings that could occur days or weeks apart and this can make the job harder for the photographer as the whole thing has to look like it occurred in one day. There are also the differences between the beliefs that could affect the wedding ceremonies themselves.

For example, the wedding between a Protestant and a Catholic has so many similarities that it is quite easy to shoot and there would be no conflict of emotions shown. However, the diversity of religion could sometimes place a stress on the photographer if the different families want their religious beliefs be the focus rather than the other.
The safest bet would be to talk to the bride and the groom over what they want their wedding to be perceived as. Who and what they want the focus of the wedding is to be. Make sure they write these down so as to make it easier for the photographer fending off suggestions.
The photographer has to be assured that the pictures taken are for the bride and the groom and not their families as conflicting families and beliefs could open the photographer of unwanted conflicts. If there is no conflict, then the photographer would have an easier time if shooting the event.
As the bride and the groom, it is a must to make everyone understand that the wedding photography is to be about them and their unity, not the conflicting or diverse religions. This really cannot be avoided and it is necessary to set the ground rules.

Mixed religion wedding photography is fun to look at as it shows differences of traditions and ceremonies involved which could be captured and last for a long time.
Planning a wedding is one of the most stressful activities that have ever been invented, especially for the bride. Not only are the tasks numerous and complicated, it is mentally and emotionally draining as well. The bride who has planned this day way in advance, since she was probably a little girl, will face complications that could stem from the women in her family who may make things complicated by making it not the wedding of the bride but their own.