We're assuming that the Christian in question is from a very liberal denomination, or someone who is non-denominational, and is someone who has a more "personal religion" approach to their Christianity as opposed to a strongly "organized religion" approach to it.
I'm specifically asking about the wedding - not the marriage - though feel free to tell me if pagan/Christian interfaith marriage is a "thing" in your experience, too.
Context: role playing game characters in a Star Trek universe based RPG. A human (the Christian in question) and an Andorian. I would like real life experience/viewpoints though.