As this is the Law section, and unless I can be corrected, being christened or not is not a legal requirement for anything, marriage, going to church school or anything else. Christians can can marry people of other faiths in a Christian church. If Catholic you have to promise to bring the children up in the faith but how many bother? CE have no such requirement and in fact have the fewest rules of any major religion. I dont think the priest, Catholic or CE, will even ask you for evidence of christening, but God will know that you are lying, which is a sin. However, morally, should you be having a church wedding if you are not a member of the faith? If you are doing it merely for tradition then it makes a mockery of Christianity and would be a sin in the eyes of God. I'm an atheist by the way.