What does it mean when a person says they're spiritual but not religious?

For me for example, it simply seems logical that their is more between heaven and earth sort of. No religion needed. Like it's impossible to rule out the existence of "God" for example. What I do know, is all forms of earthly believes in a religious sense is no narrow minded and tiny it doesn't actually even leave room for the possibility of an actual God. It's kinda funny when you think about it, Religion on earth is anti God.