If you are very much willing to accept and understand all of these, whether you are a Mormon or not, you can expect that it is fun to date a Mormon girl. I was in your same position years ago. This was the biggest one for me. Props to your sister.
I appreciate all the replies explaining the extent of the aggravation and pain I likely will face. I wouldnt encourage my kids to date a mormon. While my husband is not a doctor he does have a job that requires very odd hours a-typical of the American and works all holidays. After his mission he lost faith on everything for some reasons. The decisions we have made in how to raise our kids have been our decisions alone. So I understand how it's easy to believe nonsense when you're brainwashed from birth, and how it can be comforting to believe your life is somehow very important in the grand scale of the universe, and how you don't have to be afraid of death because you'll go on to a better place where you'll live happily ever after for eternity.
It has worked and my children are very protective of their father. They do exist and you deserve that. Vh65, your marriage is a black swan. I dated non mormon men. I don't think I'm eligible to advice, but I would say be prepared to be independent and make lots of friends.
With localized medical news and in-language editions. She might not realize how important it is to compromise. There are other occasions for humor, but these two are off the table. There are over promises in the Bible.