The thing is, I do agree that we grow, we change, we learn, and we adapt. However, it doesn't make sense that truth changes from our perceptions. You say, "What is true for me as a child is not necessarily true for me as an adult." This, however, seems to be accounted more as from a growing perspective rather than a changeable truth.
For instance, when I was a kid (I was a pretty dumb kid) I believed, among other things, that the Earth had five moons, that negative numbers were impossible (that is, you could not have a equality that stated that 1-2=-1, because the answer would be a negative number), and that I would never bleed from a rose thorn. I grew out of these beliefs, not because my beliefs were ever correct, but because they were flat-out wrong. For the first "fact" that I believed in, I think I must have misheard my first grade teacher, so I accepted blindly what he said as truth. For the second "fact" that I believed in, one of my teachers (who didn't want to bother teaching us negative numbers in first grade) simply told us that it was impossible to do. For the third "fact" that I believed in, I thought that my middle name (Rose) gave me magical powers that would make me impervious to roses. (Hint: it didn't.) All these things, however, I believed in quite strongly as a child. When I rejected these "facts" and substituted them with the truth, this was not me substituting a truth for another truth, or me taking a smaller truth and putting it into a larger truth. Instead, it was me substituting a lie for a truth.
Now, sometimes my perceptions of things changed, but the things themselves did not change. For instance, when I was a kid, I absolutely hated french fries and potato salad. You know how kids sometimes gag melodramatically on food they hated? Yeah, that was me with french fries and potato salad. However, I learned to like these foods. Same thing recently happened with wine. When I had my first glass of wine on my 21st birthday, I kind of choked it down. Now, I enjoy having wine with my meals. This is because I developed a taste for wine, just as I developed a taste for french fries and potato salad. My taste buds, as it were, changed. But, my perception of these foods didn't affect the actual foods themselves. The problem, as it were, lay chiefly with me. Nor did my perception change the truth about these foods... it was not the food that changed in my mouth so that it would taste odious to me. It wasn't like the french fries planned to assault me by turning into the awful taste that I hated. They just were. The truth rested in the french fries existing in the way that they did. It was me who couldn't stomach it when I was younger.
Science doesn't pretend to come up with infallible truths, mainly for this reason. If we could come up with the truth, that would be fabulous. Already, we have some things that are pretty grounded and believed to be truth because of the evidence that we have collected. We have one moon, for instance, and this is a pretty well-grounded fact. But, the true scientist would not call this a truth either. As you suggested before, when science is dogmatic, scientists often misses tiny little bits which, if they looked into properly, could be discovered as something greater. In my biochemical engineering classes, my professors spent full lectures on discussing the implications of a correlation and statistical analysis techniques and the perils of misperceiving data. This is stuff that we take very seriously.
However, it should be noted that this is the pitfall that scientists have to be wary of -- what truth actually is is not under debate. Just like the french fries that I used to hate, science doesn't change to fit someone's perspective. It simply is. While people may wrangle over experimental results and whether this data really correlates into this, the truth (which we try to uncover using scientific methods and reasoning) remains static. Truth doesn't change, just because we ask it nicely. That's because truth is not based on our perceptions, but rather what actually is.
When it comes with relationships with people, of course, this makes slightly more of a problem. After all, just as I have perceptions of food, people have perceptions of people who have perceptions of people who have perceptions of people, etc., etc. So, when people look at each other, their perception of that person might prejudice them (in a good way or a bad way) about these people. Plus, people do change. It happens. Whereas the law of gravity is pretty constant in our macroscopic world, there is no similar consistency with the law of personality or whatever. We have free will, of sorts. It gets complicated. And, it's true that, when you grow up, you recognize more complex relationships with people, because people are complex creatures. As I say before, I agree with you when you say that we grow, we change, we learn, and we adapt. That's part of the beauty of being human!
In any case, we're getting off the subject. The main thing, I think, is that truth is truth. Many times, when we are children, we don't substitute a truth for a larger truth, but rather substitute a lie for a truth. When I saw my parents arguing for the first time, I realized that they didn't get along all the time. The idea that they did get along all the time was a lie. When I, after running after a small dog, trying to save it, watched it get hit by a truck and instantaneously killed, I learned that you could not save everything, though you might try your hardest. That idea was a lie. And so on and so forth. I cannot think of one instance that I thought something was one way and it was simply part of a larger truth. Either I was right or I was wrong. And even when I was partially right, I was also partially wrong.
As far as whether people can be kind and generous and loving, without religion or within a diversity of religions? I think this is quite apparent. As far as whether people can be inspired to do beautiful things by a variety of influences, including religious? I think this is also quite apparent. I am not trying to say, "If you don't believe in such-and-such, you are a horrible person." Nor am I trying to say, "Oh, well, if you don't believe in such-and-such, you are not capable of beautiful things." That would a lie. Besides, I know too many lovely, creative people who are atheists, agnostics, or share a different faith than myself. So, that's not the issue here at all.
My concern, rather, is that the religions that base themselves after being "true" would be hurt by the huge diversity of religions. If one religion is truly right, then the other religions that oppose that true religion are wrong. Mind you, these religions might share some similarities to each other in certain parts and they may preach and believe certain things, so they may be partially right. However, on everything that they oppose from the truly right religion, they would be wrong. They could never fully be right.
With that said, it seems to me an odd thing that diversity in religions is a good thing, if you take religion seriously and believe it to be the true way. In fact, one would think that religious diversity would be grounds to dismiss religion altogether and dismiss the truth of religion. I suppose you could look at religion as an interesting philosophy and pick and choose what you want, but then it's not really a religion but rather a philosophy. I suppose you can also look at religion by saying that, to your perspective, it is true. However, in this case, you are assuming that your perspective is right all the time, and I don't necessarily think that this is a good assumption to make. I guess you could believed in a religion because of convenience, then you could probably look at religious diversity with apathy and not really care about it. But, then, you would not be questioning faith, as you put it, and that would be rather a loss, I think!
Or, I guess my objection would not matter if there was a religion that did not claim itself as being true. If a religion claimed that it could be false, then this argument would not work, obviously.
As far as religions who claim that multiple religions can be correct... that seems a little bit odd, seeing as how many religions fundamentally contradict themselves.

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