This theory seems to solve the problems associated with Correspondence theory and allows us to say nearly meaningless things like “everyone is entitled to believe what he or she wants.” This theory argues that truth is constructed by people. Truth is nothing more than what seems obvious when you consider the society from which you come including its historical and cultural context. When you consider the long history of Europe and the spread of Christianity, it seems obvious to anyone that came out of that culture that Jesus was the Son of God and died to forgive sins. This is how they came to consider Christianity to be true. And so it is. When you consider the long history of the Middle East and the spread of Islam, it seems obvious to anyone that came out of that culture that Mohammad was the final prophet and that Jesus was not the Son of God but only one in a long line of prophets of which Mohammad was the last. This is how they came to believe Islam to be true. And so it is. We often see this view expressed when people say things like “That might be true for them, but it’s not true for me.”
This works, as long as no one ever talks to one another or starts making claims on one another. But both of these religions believe that some very real consequences having to do with heaven and hell are riding on their version of the truth. When an eternity in heaven or hell is at issue, it’s not so easy to say that something is true for one person but not another because (and both of these religions have traditionally believed this) on judgment day, something is going to shake out and it can’t be both of these things.
And, once again, saying “That might be true from them, but it’s not true for me,” isn’t usually an attempt at understanding someone else’s point of view. It’s almost always a way of ignoring it.