What is something you absolutely believe it's true, even if others disagree with you?

For me it's this-

That there is something beyond us that created everything. Everything is just too perfectly calculated to say that it's not and just chalking it up to the big bang theory or evolution is just us trying to play God when we don't even know everything about the universe. Why we were really created and why we are here with so much knowledge and power out of all the creatures on earth? Why humanity? I can die not believing in God but what would it hurt if I do and die right? I would rather go out with a belief that could potentially be true than go out with no faith and it being true and then either end up nowhere or worse hell.
What is something you absolutely believe it's true, even if others disagree with you?
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