Why does The Church of Jesus Christ of Latter-Day Saints have over 88,000 missionaries in over 150 countries? Why are "Mormons" so anxious to share what they believe with others? Are we wishing to grow the number of our Church members? Are we collecting "heaven points"? Are we hoping to brainwash people?
This talk by Elder Bednar from the October 2014 General Conference explains the REAL reason million times better than I ever could.