There are some pretty clear ways in which religion and spiritualism differ.
Religion: This is a specific set of organised beliefs and practices which its adherents are required to follow.
Spiritualism: This is more of an individual practice, and does not require it adherents to accept or do that which they find they cannot or do not understand. It also relates to the process of developing their understanding of the philosophy of Spiritualism and the Seven Principles.
Organised vs Freeform
Organised: One way to understand the relationship between spirituality and religion is to imagine a game of football. The rules, referees, other players and the field markings require you to play strictly in accordance to the rules and directions of the referees. In a similar way that religions direct it is only through believing the dogma and through set prays and exhortations will you find your spirituality.
Freeform Kicking the ball around a park, without having to play on the field or abide by all the rules and regulations, gives you sense of fulfillment and fun and still be able to express the essence of the game.
You can do either or both
You may identify as being any combination of religious and spiritualist, but being religious doesn’t automatically make you spiritual, nor does being a spiritualist make you more spiritual.
Expressing your spirituality is in how you live, you intentions, in the words you speak and your actions