"The SERPENT OF FIRE is the symbol of kundalini. It lies dormant, coiled at the base of the spine, beneath the Muladhara chakra. The objective is to ascend the serpent (powerhouse of energy) from the base of the spine, through all the seven chakras and out through the crown chakra at the top of the head. In order to do this safely, all seven chakras must be completely open and unobstructed. "
Satan is a real being like us with a physical body outside of us. The kundalini is inside us, inside the base chakra as the above passage mentions.
The Kundalini Serpent is a serpent lying dormant at your base chakra, the serpent ascends your spine through all seven chakras through your crown chakra when your achieve god-like power. hope i helped and try reading more about it on the joyofsatan website if you want to learn more