I read the post that you have cited.
A post (ideally in the religion forum) which simply advocates belief in Mormonism (or Judaism, or Buddhism, or Jehovah's Witness"ism", or anything else, even Islam) is not an attack on your faith.
Anything that promotes heresey, turns my Savior into a created being and the spirit brother of Satan, and any church that calls all other churches ‘whores of babylon’ and ‘apostates’ IS an attack on my faith.
BTW, JR saw that thread as an attack on HIS faith as well.