Most roots of the religious words in the Dune series are derived from the Arabic language and the Islamic religion. Islam and the Middle Eastern culture were major influences in Dune.

What does Dune say about religion?

Dune isn't trying to single out any one religion; it's trying to get at the core of religion as a whole. Dune connects religion and evolution in a way that we've never heard before. Basically, it's saying that the selfish gene and jihad are one and the same.

What is the religion of the people in Dune?

A quick look at Frank Herbert's appendix to Dune, “the Religion of Dune”, reveals that of the “ten ancient teachings”, half are overtly Islamic. And outside of the religious realm, he filled the terminology of Dune's universe with words related to Islamic sovereignty.