Some people argue that the Church doesn’t officially teach that we believe that man can become like God (sometimes termed deification or theosis). Such a claim is simply untrue. I clearly remember teaching the doctrine as a missionary; it was on the very first page of the first discussion. Most Christians already believe that God is our Father, and that we are His children, and as such we can become like Him. Indeed, we should strive to become like Him.
It is likewise included in the new missionary guide Preach My Gospel, used by all current missionaries in the field: