I used to spend hours debating, arguing, haranging the mormonism apologists at FR. Sure, I do believe the BofM is hogwash fiction and not well written fiction. But there comes a point when only God's Holy Spirit can reach folks so determined tow ork on their own salvation instead of allowing God to do it.
Recall please:
"Many are called, but few are chosen" ... "Faithful is He that calleth you, for He will also do it" ...
If so many are called why are so few chosen? ... Because so few will let Him do it.
No matter how much we want to be effective in showing the Light, only God's Holy Spirit rays can actually reach the windows of the human spirit.