Weddingbee boards

I (the bride) am a baptist (as is all of my family), the groom is a methodist, but other than him and his parents the rest of his family are all faithful catholics.  I do not know much about the catholic denomination, and my FI who is a little familiar with it has really been no help at all.  I do know that catholic weddings are alot different than mine and what ours will be.  This will be the first time I am meeting his family (we live in Arkansas and they are from New York) and I do not want to make them uncomfortable or have them dislike me because of our denomination preferences.  I'm the kind of person that to each his own, but I am so terribly worried about how they will view the ceremony since it will be a simple christian ceremony.  Has anyone else had this issue?  Is there anything I could incorporate that would be familiar to them?  My FI and his family were catholics but joined the methodist church and I know his catholic family had issues with that.  I'm just very worried about all of this.  I want to please all my new family and make them happy.