I only wish LDS missionaries would be that direct when attempting to gain converts, instead of the "all churches have some truths but we have all the truth" pablum they try to pass off so that they don't seem so extreme.
You just can't win many converts by saying we are just like you. If we are just like you, what reason is there to join us? None at all. The Church went that route from the mid 80s to late 90's and converts dropped significantly. We are now "raising the bar" but I think it's not being done correctly and that is also holding us back. What we have done is created a bunch or robot missionaries who have no joy in the gospel and have not enough variety to reach the great variety of people out there.
I think you should be respected for at least being honest. And it really worked for you?
Should have worked for everyone. JS-H-1:19 was one of the references given in the discussions. I'll have to check Preach My Gospel to see if it's still there.
My suspicion would be that you would have gained fewer short-term converts and possibly more long-term converts.
All of "my converts" (about 44 in total) are currently active as far as I can tell. One is a SP in Honolulu, one served a mission in Korea, one was a JW, one was a Jew, and several were erstwhile homosexuals returning to the Church for example. But I wouldn't pin it on this alone. Many of them had great spiritual experiences and LDS friends before we even made contact.
If you can convince people that everyone outside of the LDS church is of the devil
I have never said or implied this. I merely have taught, as is the implication of LDS doctrine, that all nonLDS churches are part of the church of the Devil for the reasons stated above. Very few people in this world themselves are actually "of the devil".
and they are still willing to join, then they really will be committed to the church.
You have to be sure not to baptize anyone who is not committed to going to Church every Sunday and paying tithing and living the WoW and law of chasity. Those are the key factors for long term retention (in addition to having friends and family in the Church) imho. I have refused baptism for every teen or adult indiviudal not already committed to those things whenever I've had a say in the matter.
If the missionaries bring to me someone for baptism who they just met two or four weeks ago and has attended Church only once, it's an absolute no go. If they bring a young person to me whose parents may be members but are not active and won't be bringing that young person to Church, it's an absolute no go. If the parents aren't willing to go or teach it in the home, how committed will this young person really be? Wait till they are an adult in that case or can bring themselves. I have ruffled many feathers with this, but ultimately most people seem to calm down and see the wisdom in it.