I think there definitely are/is, whenever you collect a symbol, the corresponding buttons on the doors light up and the scythes and the sphere are both on the elevator door and the individual levels. Also I've read a not from the dev that you can actually toy around with the levers in the parking lot area. I think the 3rd ending is just a bit harder and more secret but I believe it exists. Also you can peek through the door next to the counter at the main entrance area
edit: i found the secrets in each level now and managed to enter the church now, still no different ending :(