Augustus
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So if even if it's fictional, as long as it's comforting or leads to a better life we should believe it? But I want to know truth and have trustworthy knowledge even if it's not comforting but unfortunately absolute truth or trustworthiness doesn't seem to exist.
You can have trustworthy knowledge on many things, just not 'the meaning of life', 'the purpose of existence', etc.
These you need to determine for yourself as they are not questions of absolute truth. Value systems and worldviews require everyone to accept premises that are not objectively true (or at least not demonstrably so).