After leaving religion, I felt like I was missing spirituality in my life. Because my religion had always been my source of inspiration, comfort, and spiritual renewal, I needed to find new sources for those things. I'm going to share some of the things I've come up with.
For a while, I made up an imaginary deity to pray to, because I missed prayer. I eventually came up with "Life Reviews" to replace prayer altogether. Once every week or two, I set aside some time to do a "life review." It's quiet personal time for me to review my past goals, set new ones, think about how I've been using my time, and how I want to use my time. I record my feelings about how my life has been going over the last couple of weeks, and my goals for the next couple weeks. I keep my writings password protected, because they're pretty personal. That way I can be totally honest about everything with myself. Life reviews help me remember the big picture and my life goals. I also have some specific goals that I check off daily in a spreadsheet to keep me focused and productive.
I also find spiritual renewal through reading great literature. I mostly read non-fiction books, but sometimes fiction. I enjoyed ExMormon, probably because I related so strongly to so many of the characters in it. I even read it twice. I really like coming-of-age novels (I recently read this one), probably because I feel like I'm still growing up and figuring things out too. Good movies, musicals, and documentaries can also provide inspiration. I loved Les Miserables, Wicked, and Easy A. I think they each teach important principles that I believe in.
I've also liked service projects, donating to charities, and talking with friends and family to maintain strong relationships with them. I started doing Yoga recently, which is pretty fun. Working out and eating right helps me feel good about myself.
So those are just a few ideas. I'd love to hear your ideas for non-religious sources of inspiration and spiritual renewal, whether you're religious or not. Feel free to comment!