I'm still a little confused. 
So are you saying that your religious ceremony will not be a wedding then?
I ask because many people only have a religious ceremony and they are legally married.
So, most people just have the civil ceremony part (the signing of the legal paperwork) in their religious ceremony.. or before or after and call this whole process the 'wedding.'
We are just doing the religious ceremony (vow exchange, rings, blessings, etc) to celebrate with our families, because the visa process is long and unpredictable, my family needed time in order for them all to come to Europe to celebrate.
Also, Because you have to wait 8 days before you get registered at the local office, and then you have to give notice and wait at least 28 days to do the legal side of it, this can pose a moral problem, for people like me and my fiance who would have to live together for a month without being married. So we are doing the religious ceremony first to solve that problem.. it obviously isnt 'legally' binding until we do the civil ceremony in the UK, but we are only able to do this after a certain amount of time in the UK.