Animal have no religion why should Mam have one
Answers
Unlike all other animals, we can share our fantasies because we have language. Very little of what a religion generates has any existence outside of our heads. And indeed, the religious structures people build seem to have no other purpose than to intensify the shared fantasies. A temple or church in the world's most popular religions seems to be a modified auditorium or theater that makes it possible for everybody to listen to one person's fantasies, or to practice rituals that enhance the idea that everybody is sharing the same fantasy at the same time.
That religion is principally fantasy is easy to demonstrate by walking in to the temple/church/etc of a religion you know nothing about. You will see that the place either has no decoration at all or has decorations (sometimes elaborate) that mean absolutely nothing to you. You might even see inscriptions on the walls in your own language that make no sense. And often if you tell this to a member of the congregation using the building, s/he will be surprised or amused that the place could mean so little to you.
So to get back to the point, unless you are much more creative than I am, you won't be able to share your religious fantasies with your dog or pet tarantula.