Welcome to our vintage category!
Adding an interfaith element means you have many more adjustments to make. Work out as many as you can before marriage happens.
I think a lot of people just yell run whenever this topic comes up and like you I think that's unfair. There are all kinds of Mormons, and we as exmormons should know better than to stereotype our former selves.
For the official Church websites, please visit LDS.
By all means, I encourage you to try having those discussions and to make a mental note of when you would choose to walk away instead.