Books that teach critical thinking skills, yes.
Books that teach 'atheism', no.
Atheism is the natural outgrowth of correctly applied critical thinking skills. No need to teach 'atheism'.
Books that teach 'atheism', no.
Atheism is the natural outgrowth of correctly applied critical thinking skills. No need to teach 'atheism'.
You'd believe if you just opened your heart" is a terrible argument for religion. It's basically saying, "If you bias yourself enough, you can convince yourself that this is true." If religion were true, people wouldn't need faith to believe it -- it would be supported by good evidence.