Hmmm... It makes me feel more grounded.
Years ago I decided to seriously subject my beliefs to intellectually honest scrutiny. I learned about my biases and how my understanding of reality had skewed my experiences, perceptions and interactions with it. Upon learning this, I then attempted to toss out any known biases and ideas that didn't yield useful or accurate results. Supernatural beliefs turned out to be one of those things I couldn't justify a real use for, and they didn't accurately reflect reality, so I kicked em to the curb.
Getting as close to understanding objective reality through the limited means I possess turns out to be something I have taken a great interest in. I'm not perfect, and I'm limited in my subjective understanding, but I have a better grasp of what's going on than I did before, and I find that exciting!
A reality based in the ideas of substance monism isn't a reality without wonder. Day to day life is already a thing of wonder right now. All of existence teams with complexity that we are only begining to scratch the surface of, and there is no end in sight to the things we can learn from it. I think that's pretty cool!
I can still live a "spiritual" life without believing in literal spirits. Mastery of the human spirit, of my self and my life, is far more rewarding than what I had in the past. For the first time I know what it means to be happy in a healthy, fulfilling way. In strengthening myself, I can more positively impact those in my life.
Now, everything I have said here only applies to me. These are my experiences, and you may have come upon a different conclusion based on the things you have experienced in life. Everyone walks their own path and comes away with something different. That's what it means to experience life subjectively, and every one of us deals with factors no one else will ever be able to truly comprehend.
We can only empathize with our own ideas of what we think other people are thinking.