How can I trust you on this? You say you were once a Christian. But as Muslim think that no one who is a true Muslim would ever leave Islam, so I can't imagine anyone that had every had a personal relationship with Christ would walk away from it. You may have been a "member" of some Christian church, even had warm "fuzzy feelings" as AKK describes them. But faith in Christ and the peace that comes from giving one's life over to him is soooo much more. I believe if you had really known that, you would never have looked for or been satisfied with the type of peace you find elsewhere. I don't think you are even in a position to evaluate, let alone pass judgment on, whether or not I have a clue. That you think you can answers the question of this thread regarding Muslim attitudes twoard Kuffars -- they are narcissistic.
And here is another part of why I say that:
The ego of the narcissist is so big that he thinks it is all about him. It isn't.
Consider that God himself tolerates falsehood. Before you jump down my throat, look at the world. There is much falsehood. God has the power to change it all in the blink of an eye, but he doesn't. Rather, God allows human free will to act. To act even in destructive, disruptive, and dispicable ways. Why? Why when if he has the power and is intolerable of such falsehoods does he still allow it to exist? I suggest that there are only two answers. Either (a) God is actually intolerant of these existing falsehood, but doesn't have the power to do anything about it, or (b) God has the power, but is willing to tolerate them, at least for a time, until such time that he brings an end to human history as we know it and set all things right once again. Since I don't believe God to be impotent, I tend to think that God is therefore tolerant.
Tolerance is different than accepting. God doesn't accept the deviations of falsehood and unrighteousness that exist in the world. But he does tolerate them, showing grace toward them, at least long enough so that he might work to effect a change in them and return them to truth and righteousness. One must have a degree of tolerance, if one is to hope to make a change in that which is false and convert it to that which is true. I think that Muhammad showed considerable tolerance on many occassion (though of course not all), today's Muslim would be wise to learn and emulate that aspect of the prophet (pbuh).