Not sure why you wouldnt be threatened by mormons, especially if you believe your brand is the correct path. Many other non mormons are indeed threatened and critical of them, as evidenced by a thread in this forum,,,, unless youre a mromon then that would answer it.
The Mormons has two Testament. The Bible and also the Book of Mormons. Keep that in mind.
According to Mormons, we are children of God even before we we're born into this world. However, according to the Bible one cannot be a child of God prior to accepting salvation (adoption). You see, if we are born children of God then EACH of us would have no need of a savior and would all have to be subject to the conditions Adam and Eve were, as they did in order to require a savior (Christ) in our lives. You go explain that to the Mormons and see what they tell you.
Furthermore, Mormonism hinges on the idea that Jesus, Satan, and us are brothers because we're all spiritual children, even the angels were sons of God, so that makes us all one big family. But, until you get past these notions of exaltation to godhood Mormons have been indoctrinated into, it's not going to get far using the Bible because Mormons down plays the Bible favoring their other Testament using it when it suits them mostly to gain naive Christian converts into their cult.
This is why.