Exuberance comes first...I believe....followed by realization that you are up against a formidable adversary who concentrates only on Christianity, knowing that that is from whence he will see his doom. You then recognize that your minority position is most logical....and when you hear the taunt "All these Churches can't be wrong...can they?" The answer is actually, "All these Churches can't be right...can they?"
Our adversary will continue to divide and conquer.....keeping most of organized Christianity in their own little corner of Apostasy. That is why this forum is so valuable as many folks who normally would not be exposed to Biblical truth and logic may find it here from time to time.
In answer to Chris's question, sometimes those that grew up in truth are a little less passionate, but sometimes they're just tired of butting their heads up against a brick wall for so long. The truth is so obvious to us that it's sometimes difficult, and frustrating, for us to accept that others just can't see it. It's right there! In black and white, in the bible! Yet for whatever reason God has not decided to call everyone at this time so the truth isn't obvious.
God does call people, and he sometimes uses us as vehicle to draw them to the truth. As Diego said, we need to continue to use this forum and other vehicles to get the truth out.