I agree with Terra Drake, religions by definition think that they're right, and that the hold The Truth (capital 'Ts'). It reminds me of a story I read once:
A prince wanted something special for his birthday, so he ordered for an elephant to be brought to his kingdom. The thing is, nobody in that kingdom, not even the prince, had ever seen or even had an idea of what an elephant looked like. When the animal was delivered, the prince had it put in a special barn that was completely dark, so after the animal's handlers departed no one remained who knew what to expect.
The prince kept the elephant as secret as he could, with the intention of showing it to his subjects on his birthday. Of course there was much speculation, and bets about the elephant, so a few ingenious people devised a way to find out what the animal looked like before time.
They hired blind men, assuming that they would be able to tell what the elephant looked like by touch, and managed to get them inside the barn. Unfortunately, the elephant panicked at the intrusion, broke out of the barn, escaped and drowned in a nearby river. In the confusion nobody was able to see it, so they asked the blind men to describe what they had managed to touch.
'The elephant is long, like a tube,' said one.
'No, thee are mistaken, it is like a rope, with a tuff of hair,' stated another.
'Both of you are wrong, the elephant is smooth and ends in a point,' interjected yet another.
'You are all not only blind but also stupid!', said the next, 'the elephant is heavy, and shaped as a column.'
The debate was animate, since a lot of money rested on what the elephant really looked like, but no one could agree on what that was. The result was an all-out conflict, with each group believeing they knew what the truth was, and demanding to get their bet money. As for the prince, after the fiasco he never ordered another elephant, so the fight endured for many years.
The point of that story? Each blind man had a part of the truth, but believed he had it all, and never considered sharing their knowledge with the others in order to get a more complete picture. Even if they had they still would have been off the mark, but much closer than with their individual belief.
I don't think that we can know The Truth, simply because our brains are not powerful enough to grasp it, but maybe the whole point is to look for it, and get as near it as humanly possible.
Beauty In Diversity