Mormons historically do not broadcast their doctrine so many are indeed unfamiliar with it and would consider it odd. Actually its not all that different when compared to other religions out there. While Mormons are certainly not following historical Christianity doctrine, but they are much closer to it than any other religion I know of.
Mormonism perverts everything about Christianity.
The only thing mormonism has in common with Christianity is the name, Jesus Christ - and they mean an entirely different Jesus Christ when they use his name.