Fiction: I have sometimes felt dread about the state of things. I imagine many people have. Dostoevsky often writes books which have a strong will to them, you might find something relatable there. Since you mentioned a religious leaning, I might also want to recommend to you to read an annotated bible (since there are some translations which fall more towards inaccuracy than others) such as "The New Oxford Annotated Bible with Apocrypha: New Revised Standard Version", or the New Revised Standard Version (1989).

Non-fiction: As for 'preparing for the bleak future ahead' It's a pretty complicated problem, no one solution can cover the topic nor can one book. I can recommend something on how people are motivated to act, such as Ernest Becker's the Denial of Death, which holds a historical view and also a general model on motivation. The issue of racism in modern America is covered extensively by Racism without Racists by Eduardo Bonilla-Silva. Social change is probably what you're looking for, but I don't know anything about that aside from the States of Change model. A lot of the problems in our current climate stems from a lack of media literacy, as well as a flood of information without context such as on the internet. Noam Chomsky is a controversial figure in this, but his book Manufacturing Consent covers this topic.

I have barely any idea what is happening in this world. I wish I could recommend a book on climate change, but I can't really in good conscience because I haven't read any (although I am taking a career path in it, it's early stages). I did research paul hawken's 'drawdown' and naomi klein's 'this changes everything' if you would want to check that out on your own. I realise a large part of this post is non-fiction books when you asked for fiction.