Let there be no misinterpretation of where I stand. Mormonism is heresy and is not Christianity. It's a cult in the same sense of Scientology, of which Greta van Susteren is a notable member. Jim Robinson has made things crystal clear concerning Mormonism, stating:
The so-called book of Mormon is false gospel, ie, fiction. It has nothing whatsoever to do with Christianity or the Word of God.
On the other hand, although I don't know any Mormons personally, I tend to think, on temporal matters, they don't present much of a danger. Your latter (pun intended) point is probably quite right about Mormon youth.
I agree.