In the long run, such actions only make one look prideful and ridiculous ... and produce needless, worthless, anger. Flame wars result when no moderator exists to extinguish them.
I have observed repeatedly that attempting to read “the other guy’s” mind, and presuming to know his beliefs, his thought patterns, his practices better than he knows them, serves no good purpose.
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That presumes 2 things. 1) That the ‘other guy’ is actually telling the truth about his teachings/practices/beleifs and 2) that the person involved does not know the other guys beliefs (or churches beliefs) better or has not been a member of that church.
For example, as a former Mormon, I am keenly aware of LDS beliefs/history/practices and I do know them better than most members (and did when I was LDS), furthermore I am aware (and was guilty of when I was LDS) of their practice of ‘lying for the Lord’ where omission obfuscation and outright lying is considered ok as long as it protects the Mormon church.
Finally, I am often attacked, without any proof, of taking things out of context, lying, etc. when I can (and do) back up my assertions while those who attack me do not.
There are some who will hate you, lie about you, and attack you just because you are telling them the truth, in a loving manner but because they do not like the MESSAGE, they attack the MESSENGER.
The Message of Christ crucified is offensive to many.