Because we live in such a pluralistic society, and because I value diversity in all things, I've chosen to make the spiritual realm a very private matter, and choose not to engage with it in group settings. I don't generally discuss it or experience it with groups of people. In public I generally compose myself as a rational, secular, agnostic. This has more to do with respect for others' beliefs than any statement about my own.
Does this mean I am a secular person engaged in secularism? I don't think it's that simple. It means I recognize that life and people and society and religion are all complex and overlapping, and I prefer to avoid coercion of any kind. I'm also sensitive to appropriation and acculturation and the dangers involved. A large part of the reason I am concerned about these things is the simple fact that I would strongly prefer that others not impose or coerce their belief systems on me.
One of the things I love about spiritual art (as opposed to religion) is the fact that we can communicate with each other through it about spiritual matters, without requiring particular commitment or engagement from anyone in particular. People can choose to take something from your creation, and potentially return the favor with their own art, or not. I find that situation infinitely more agreeable than sitting in a church pew quietly for a set amount of time while listening to someone drone on about how this religion is the one true religion and the only path to [insert concept representing a transition from an unpleasant state to a more agreeable state on some eternal time scale here].
I'll make an exception and explain a few of my beliefs here because I trust you folks to know I'm not in any way proselytizing. I don't believe any religion was handed to us by God. I don't think we know God's name, appearance, or even gender (or if gender even makes sense when talking about a god). I believe religions were created by humans for human motivations. Some of those motivations are noble. We want to better understand the reason for our existence. We want to better understand how to compose ourselves, our lives, and our interactions with others. But we don't always share goals, what we hope to achieve with this greater understanding. Some of us want a greater peace, a more shared understanding of love and compassion. Others are in it for reasons having to do with control, fear, repression, and even hate. I don't believe any religion has a rightful claim on the whole of truth.
I don't feel reason and rationality are necessarily incompatible with spiritual matters. Buddha once said “Accept my teachings only after examining them as an analyst buys gold. Accept nothing out of mere faith in me.” I find relief in those words.
Apologies for the tangent from art, but I often feel religion and art are interchangeable words for similar basic human drives towards some kind of shared understanding.