Every church has their own rules as to where Photographers can and can't go during the ceremony.
Your Wedding is a pretty special day right? It's so special that you have hired someone you don't know really well to be with you all day while they take photos of you. As a photographer, when I show up to the church I always introduce myself to the officiant to find out what their churches rules are. Most of the time the church is pretty relaxed about where I can photograph from as long as I don't interrupt the guests or the couples of course. But every so often you will show up to a church only to find that you are not allowed to come closer than the last row of seats. Man does that sting to hear because I LOVE to get shots like these that require me to be much closer than the back row!
But rules are rules and you have to make the best of every situation. Worse things have happened throughout history. So you pull out your zoom lens and you wait for the perfect moment! If you're lucky magic happens!