Books free thinkers should read?

I have always been a free thinker.However, there is lots of literature out there about this. By people like Dawkins,Harris,Sagan,Darwin,Payne etc.None of which I have read.

I am aware that some stuff may be outdated.I’m also aware that some may not be considered free thinkers.However, you should get the idea of what I’m talking about.Without me having to say anything

I’m just wondering what would be good starting point author or title wise.Thanks for any help.

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