I am confused.
What principle(s) are you using to determine if something is true?
You haven't really explained that, all you've said is that if someone think something is true - it is, to them at least.
And that is actually what I think in relation to the matter. For example, I understand and recognize that what I believe to be true for me is NOT what the consensus reality currently consider "true". That does not make a difference unless I also believe that I need to change the consensus reality somehow to match mine. And that road is paved with empty arguments, frustrations, disappointments, and ultimately: the fear "what if I am wrong?". That fear stems from the belief that there has to be one objective truth and if you are not acting according to that, you basically "wasted your life". But this is just a belief as well.
To you, is there anything that you consider false?
Or is everything that is presented to you a truth?
I consider this a game where you raise your vibrations or lower it. If you use your tools and your knowledge to be more content, more balanced, and potentially share this balance or feeling of love with others, you ultimately make a better experience for the mass consciousness as well. So I do not care whether something is true or not, the only thing that is interesting to me is whether it empowers you, raises your vibrations and your state of being, or it depowers, separates, pulls you down.
I see fear-based religions in our current reality, I see fear-based materialism, fear-based atheism and I see positive ones as well - from both "sides". I tend to stick to what inspires, what helps. What tries to separate falls off for me. (But as far as I understand it, there are consciousnesses paralell to us that DO want to lower and lower the vibrations just so they can experience that. Just to see how deep the hole is. But ultimately, you will get out of it.)