What is Truth?

So in my Christian club at school I spoke a little about truth. The first question that has to be answered is obviously "what is truth"? The best answer I could find was that truth is in accordance with fact or reality. I then wondered what makes something true? Truth has a lot of criteria to it and is quite complicated. For something to be true, it has to correspond to fact and to reality, as I said before. Another idea is that truth is what we all agree it is. For example, we all know what the color white looks like. Even if the color looks different to all of us, we all agree that the color is white. This isn't a very satisfactory for truth though, because sometimes we don't all agree on something. For example, sometimes one person will say a color is blue when another person will say it is green. So what is the truth? No one really knows. We could go with the majority, but that goes against the idea of what truth is. Truth has to be indisputable. Certain truths can be created by people, which may sound like it goes against the idea of truth. In math, two plus three equals five. Numbers and math are not in nature, but were created to describe what we observe. The concept of numbers is man made, but still is logical and holds truth to it. By what we define as "three" and "two", and "addition", the sum of three and two is indeed five. That is a truth, even though we made it up. Not everything we make is truth however. People created religions, which all cannot be true. Multiple ideas of a same concept cannot all be true at the same time. You cannot say you were at multiple places at one time. Either you were at one of those places or you lied and you were at none of the places you said. The point is that either one religion is right, or evolution, or none of these is the truth. Now think of the law of gravity. Gravity says that everything goes down (on earth anyway). If I have a pencil and I hold it up and I drop it, it will fall. This will happen even if I do it everyday, hour, minute, or second. What am I getting at here? The truth cannot fail. It cannot be disproved. Gravity is true because we have not been able to disprove it, and so far it has not failed. Therefore the law of gravity is a truth. What makes something true is that it corresponds to fact and reality, and it never fails.
-Smart