Oh, don’t get me on my soapbox, Z.
“Defending the faith” means that you defend YOUR faith, not attack others. If you get on a forum devoted to the discussion of, say, Mormonism, and you are constantly criticizing Mormon Doctrine (or at least what you think Mormon doctrine is…not necessarily the same thing) then you are NOT defending the Catholic faith. You are attacking the Mormons.
but the Mormon is defending HIS.
Here is a hypothetical situation: a couple of Mormon missionaries come to your door. They start a lesson about the Godhood, and you soon get ear-deep in a discussion of the Trinity. They keep asking questions and presenting the reasons for their beliefs, and you respond by presenting the scriptures and reasons you believe in your version of the Trinity. You are defending your faith.
Another situation…not very hypothetical at all. There is this forum dedicated to the discussion of non-Catholic religions. Several of the threads are dedicated to Mormonism. You join them, and all your points are about how stupid, cultish, evil and nasty Mormonism is. You claim that Mormons believe this thing, or that thing…and you never once discuss what Catholics believe about the issue under discussion or present scriptures/reasons for that belief.
In the meantime, the Mormons on that thread are either defending their beliefs (that is, if you got their beliefs right, which happens every so often) or are saying that no, they don’t either believe THAT, they believe THIS…and are not discussing the Catholic beliefs on the matter at all.
In THAT case, Z, you are not defending your faith. You are attacking theirs. THEY are defending their faith.
Here’s my third and last hypothetical situation: suppose that a Mormon went into, oh, any other sub-forum BUT 'non-Catholic religions" and proceeded to tell everybody there that they were idol worshipers or cannibals or Mary worshipers (you know, the standard anti-Catholic claptrap). You respond to that person, explaining the truth of your beliefs and debunking his erroneous claims about you. NOW you are defending your faith.
The phrase “The best defense is a good offense” only applies in war and politics, Z. So much so that if you use it in religion, it *becomes *war and politics.
By the way; I haven’t looked, but I’ll predict that there aren’t any Mormons in those other forums in CAF doing any such thing. Further, I’ll predict that the moderators haven’t had to keep any Mormons from going onto other forums in CAF to do any such thing–and if there is one, lemee at him.