Mature advice needed please..urgently..?

I think you need to do what YOU and your fiancee want to do. And BOTH of you need to have the wedding YOU two decide on. If your parents or his parents don't like it, then you can tell them that neither one of them are invited. Don't have a religious wedding, make it neutral. If they want to support you then they can. If they want their personal agendas and beliefs take over your happiness then march forward with your own wedding *without* them. They will bend once they see you're no putting up with it.