I exist perhaps
Religion is stuff other people made up. Personal spiritualism is stuff you yourself make up.
To some degree, religion becomes what you yourself believe. Although the general concept and framework is created by others, the intricacies are made so as to fit your current beliefs. The god becomes your ego, and follows your intuitions and opinions. This is why so many people can believe in the same deity but act upon it in so many different ways.
For example, some feel that non-believers should be killed, or be forced into conversion, while others believe that anyone is free to believe what they want. Either way, their actions always seem to abide by the followings of their religion, and that is because religion becomes what you want to believe.