Personally I went for the registry office option. I wanted to get married because I was making a committment to my Mrs. Knowing both of us, an easy-out realtionship would not have lasted, so instead we've opted for plenty of making up over the years, once we've got over the intital issue whatever it might have been.
Her Mum was a Church Warden and had real issues with our approach. My response was:-
a) If my Mrs wanted me to marry her in Church I would be prepared to do that , but only if she asked me to, and not for anyone else.
b) I did not want to start my married life off with a lie.
Wifey never asked, and we did our thing in the R.O. We are having our 30th anniversary next month, and I highly recommend as a result that anyone planning on getting married thinks it through and makes decisions based on their beliefs and no one elses.