You don’t need to believe in any religion, though even theists are very selective followers. The point is to use philosophy from religions/etc to inform your own worldview and improve your life.
My point is, why believe that philosophy has merit, or that you'd be able to distinguish the good parts from the bad parts? (And if you are able to distinguish good from bad philosophy, why would you need an existing religion as a starting point?)
Obviously, the authors must be beyond reproach in their lives. And, do ensure that everything in their writings & speech are “good” before their time, during their time, during our time, and for all future times to come.
Your other point seems to be that it’s better to avoid all this, and start from scratch. It’s good for you that you are able to inform yourself of everything with no materials. The rest of us need something to go off of.
I have a lot more faith in an imperfect source that acknowledges itself as such than a source that purports to be perfect but isn't.
Something tells me you’re not arguing in good faith, so I’ll stop engaging.
Religious philosophy is generally embedded in a paradigm where that religion is correct, and where scripture in particular is perfect and infallible. So it's not at all obvious to say that you can pull value from it outside that paradigm.
I don't understand why people still consider literature written by human with nowadays language to must be either perfect or it's worthless.
Also how they see a form of government that declared they're adopting one religion teaching and using it as argument proof / point.
We will spiralling down to whataboutism soon like this. Cherry picks the good ones are fine, and people do that everyday. Just don't cherry pick a bad one to justify your agenda and your bad action.
Here's a religious code people can live by: "Don't be a dick". I'm sure that summarizes all the good parts of organized religions and philosophies. It's also the most difficult one to adhere to for a lot of people.
I don’t believe this is the gotcha that you think it is.
Every single school of thought, religion or otherwise, has good and bad parts. Taking the overwhelmingly good aspects of Buddhism to understand how to lead a better life, is not invalidated because the Buddha said one thing you dislike. It’s naivety to desire 100% perfection from everyone/thing.