I'd like to notice something here. With the exception of fearful sheep who claim to follow Christ because they either hold a church membership (all too easy these days) or those who are trying to prove themselves obsessively through a cult mentality, Christians on the whole tend to be more tolerant of other religions than anyone, especially secular humanists. There are a couple of reasons for this, and I'd like to set them out while I'm thinking of them.
Christianity is based on love of all people, regardless of their looks, religions, jobs, and sin. When you truly love as God loves, or rather as much as you are able given your flawed human form, you will not despise members of another religion. You may feel sorry for them, and you will likely wish you could, as Jesus said, gather them under His wings like a mother hen protects and warms her young, but you won't despise them. You won't want to kill them. You won't consider this world a better place without them.
(This doesn't have to make everyone total pacifists. It is terrible but true that in this fallen world one man may have to be killed to protect others. The instructions given to soldiers was not to lay down their arms, but to be content with their salary and not oppress the people they protect.)
There are some people I term 'hyper-Christians' who have their hearts in the right place, but irk those who hate them by focusing so thoroughly on this love that they badger people continuously in hopes of saving any of them, for honestly no other reason than that they would not have anybody fall to destruction. They are different than the 'gotta-catch-them-all' Christians who do so as some kind of sick attempt at a spiritual 500-Saved-Club. God doesn't work with numbers that way, and that leads me to another reason why Christians tend to be tolerant.
Christianity is a matter of devoting your whole self, body, soul, and mind, to God. Nothing less will do, and nothing more is required. Unlike religions where all you have to do is say a phrase and complete the appropriate rituals, or learn your sayings and 'mean it', there is no way to be a lukewarm but genuine Christian. Those who don't care much will fall away, and those who do care will end up in the right direction. Therefore, despite what happens when Christianity (or any religion) meets Power-Hungry, you cannot force conversion and have it stick. Conversion must be not only self-initiated, but anyone pushed into it or led by the nose will invariably end up as rocky or weedy soil. (Those of you who don't know what that means, there's a parable, ask and I'll tell it.)
Christians have a strong base on which to stand when they stand on their faith. Most people who get confused about it are easily confused by shallow tricks (like the old 'how can a loving God disapprove of homosexual acts' etc.) that are easily defeated with an honest understanding of the Bible, rather than an attempt to crowbar it apart. The accuracy of the Bible and support for it's claims surpass the proofs of many historical events that children are taught in school. I could go on, but I don't mean to get into all the proofs here... search them out for yourself. My point is that Christians don't have to shut their ears to any information about any other religion for fear that, as the Nip and Tuck webcomic put it so nicely, their 'worldview will throw a piston rod'. The point of many other groups, particularly gay rights and abortion rights groups, is not only to deliver their message but to silence opposition due to this fear.
These are the three attributes of tolerance from Christians: A sturdy base of faith, a true love for those not of their religion, and an understanding that faith in God must be real and never forced.
From that comes an unprecedented tolerance for those of other beliefs that surpasses the majority of other religions, including Islam, which is beat out for last place in the tolerance game by Secular Humanism because even the most extremist Muslim-led country will allow other religion adherents as second-class citizens.
I continue to study the Quran out of curiosity, unafraid that I may risk eternal damnation by finding something that makes more sense than what I already believe, or that I may find my own religion to be faded and threadbare in comparison. I haven't thrown a piston rod yet, and from what I've read so far, I seriously doubt that I will!
I do plan to do more on that series.. it is not over. For the time being I have been doing spring cleaning, homeschooling, gardening, and basically managing the household, a job that has rather overtaken my free time for a while.