Satan has gone by many names, he is a chief deity in all the pre-christian, pagan religions.
Enki is Sumeria, Ptah in Egypt, Poseidon in Ancient Greece, Shiva in Ancient Hinduism, And many more. He is a dirty worshipped globally, long before any of the recent "abrahamic" "religions" created by jews to deceive humanity and have us forget our Gods.
Satan also is a very real being, not an imaginary deity, or some belief or force. We know Him and the other Pagan Gods to be very real, extremely powerful and extremely advanced beings.
These beings, we know they are the creators of humanity, this creation dating back some 72000 years ago, where proto human species were uplifted by Satan and the other Gods, to become the humanity that we are today.
3 main races were created, who would be considered the three original gentile races, and all gentiles on Earth stem from those 3 (the three gentile racial groups are broadly the Whites, Blacks and Asian people).
Satan, being our creator, and having power to do such things, exists on an exceptionally high state of being.
We recognize Him for who He is, as the God that He is, and know Him to be a real being, unlike the false "gods" of "abrahamism" (christianity, islam and judaism), which are nothing more than thoughtforms or malicious alien entities parading as gods who hold not even a candle to Satan or any of the Pagan Gods in terms of power or status of being in the cosmos.
To follow Satan, is to walk the path of spiritual advancement, self improvement and growth on all aspects, with the ultimate goal of the path by the Joy of Satan being, to reach Godhead yourself.
To be under Satan's tutelage so to speak, and walk the path to the Godhead, as pioneered by Satan Himself.
This path of Spiritual Satanism is a practically infinite path of growth and realization, where the true path only begins after one has achieved the highest Earthly achievement of reaching the Godhead, one becomes eligible to ascend out of this lower world, and reach a higher world, the world of the Gods, to continue growing and advancing further on a higher plane.
This may sound very abstract, or perhaps even like nonsense, however it is something which anyone who truly sees Satan can understand as fact, it is the way of life.
Either to waste away under the entropy of the universe and dissipate into nothingness, or to advance spiritually and reach the timeless state of the Godhead, to ascend to a higher realm and become as the Gods yourself.
Maybe in a few lifetimes, or maybe after dozens of lifetimes and hard work.
The Spiritual Path presented by the Joy of Satan has, until recently, been cut off due to the "abrahamism" invented by the jews, which is nothing more than a cheap knock off of our original pagan beliefs and in reality worships only death and damnation, is the cause of all strife and degeneracy on Earth today, and actively seeks to turn people away from Satan, the original creator, at the behest of other inferior extraterrestrial beings who seek to rule and exploit humanity.
The Joy of Satan seeks to restore the lost knowledge of the ancient spiritual path that our ancestors followed and knew openly, restore the connection that Gentile humanity has to Satan and our Gods so that people may find Them once more and reconnect to our creators, to find the spiritual path once again and remove the degenerate and corrosive elements of society through the uplifting of the Gentile spirit and the true enlightenment obtained from advancing under the Gods.
Azazel is one of the 4 Crowns. Together with Satan, Baalzevulon and Inanna, they are the 4 chief Gods, the ones with greatest power and of the highest existence.
Azazel and Inanna are to us known as Satan's children. However, after working with the 4 Crowns, it is evident they are all unfathomable beings, unfathomably high and powerful. Timeless existences. Gods if you will.
There is more information about this on the Forum, specifically in High Priest HoodedCobra's sermons.
Azazel has also gone by many names. A few of the most well known are the Sumerian Utu and Greek Apollo.
However, he has been known in all the pre-christian Pagan pantheons by different names (all of which predate the "abrahamic" religions by thousands of years).
Azazel is also one of the major Patrons of the Joy of Satan, having helped us extensively, specifically having helped High Priestess Maxine, the creator of the Joy of Satan website, to find the necessary information to create the JoS website to begin with.
It was done under direct tutelage and communication, to restore Satan's Temple on Earth, which has been lost and blasphemed against for over 2 thousand years now.
Finally, on your last question.
We are Polytheistic. There are many Gods we recognize, over 72 are named on the Joy of Satan website, and as all the Pagan Pantheons, we worship many Gods.
There are in fact many more Gods than those who are named on the Joy of Satan website, as the Gods represent higher beings who have ascended past the mortal state that we find ourselves in.
There are many such beings out there, all of whom are in allegiance with Satan, under Him.
Satan, from the root Satya, means Truth. All higher beings are in search of ultimate Truth and realization, therefore, all are under Satan. He is the highest being, the All in All, the God of Gods.
Therefore, we worship many Gods, however we recognize Satan as the leader of All, and give Him the proper respect as he deserves for being known as the God of Gods.
That said, the 4 crowns are all unfathomable and exceptional.
Baalzevulon is also known as Zeus, who was known as the chief God and praised as the All in All in Ancient Greek.
Baalzevulon is no less high than Satan, both are All in All, true Gods in an absolute sense. However, to the Gods themselves, and even the other Crowns, Satan is recognized as the leader of them all, therefore he is placed first and is the chief God we all align with and dedicate ourselves to.
By dedicating to Satan, you dedicate to the path of Spiritual Satanism, and walk the path of the Godhead, together with many extraordinary great beings out there who are always seeking for ultimate Truth and realization while advancing higher on their own respective Paths.
All this is governed by Satan, it is given by Him, originates from Him, and thus All follow Him in the pursuit of Truth.
Hail Satan!