There are those who worship and promote evil, not demons. Those who dabble in the occult may try to "invoke" demons, but they aren't "praying" to them. In actuality, the word "demon" is derived from the Latin word daemon, which translates to the word spirit in English. So basically, the "demons" that you refer to are in actuality evil spirits. Ironically, the word in ancient times meant "divine power", as in the Greek version of the word.
From Dictionary.com
de·mon Pronunciation Key (d  m n)n.
[Middle English, from Late Latin daem  n, from Latin, spirit, from Greek daimn, divine power. See d - in Indo-European Roots.] |
You are aware of the fact that both the New and Old Testaments were translated from Greek aren't you? Have you ever heard of the Septuagint?
All of those who pray to pagan gods are praying to "demonic" entities.
Although they may represent false gods, they are not necessarily demonic in nature.