I find it odd that when filling out a form that asked me what my religion is one of the choices is Atheist.
What now? That is the that opposite of religion.
I would suggest that various flavors of Satanism have a dogma, and more than one version has scriptures, be they LaVey’s book or the Satanic Temple’s tenets.
I can understand why the Satanic Bible might look like dogma, I don’t agree that it is. And religions like the Setians specifically don’t have any dogma.
I think your point generally holds true largely due to the reality of the world, in principle and philosophy though, totally possible to find counter examples.