And as long as both parties in a dating relationship are ignorant of these facts, they can get along just fine.
In the case of Mormonism, I have articles posted on the Web site that detail the official teachings of this religion, documented by direct quotations from its "prophets and apostles." See Mormonism for a list of these articles.
Most people are rather shocked to find out what Mormonism really teaches.
A good aid in this regard would be my Scripture Workbook.
The bulk of this book presents the Scriptural basis for the "essentials of the faith" - the most important doctrines that define Christianity.
I have even received emails telling me it is "ridiculous" or "silly" to say that there would be problems in such a relationship due to religious differences.
So the first thing I do is to encourage both parties to better understand their own and the other person's faith.
And what I try to tell people is it is best to hash these things out now, before things get serious, than later, after you're married with children.
In fact, I have received emails in which an interfaith marriage resulted from such a dating situation.
A Christian dating a Mormon; a Christian dating a Jehovah's Witness; a Christian dating a Jew; a Christian dating a non-Christian; a Protestant dating a Catholic; a charismatic dating a non-charismatic, a Catholic dating a Mormon.