inflexibly and unthinkingly committed to doctrine; having an inflexible and narrowminded understanding of the fundamental ideas of one's own religion or ideology; narrowmindedly doctrinal; fanatical
I am religious, but I am not dogmatic: I believe that religion, like all other institutions, must not be unthinkingly tied to antiquated rules.
dokein (to seem good) (Greek)
If you try to read "dogmatic" from back to front, you will get "i am god". the person who think that he is a god is arrogant and stubborn