Its for rituals. The elevated dirt is too keep prying eyes away. The circle and cross with a square in the middle is a Masonic/Templar symbol of the sun and the square is our plane of physical reality. The 4 circles surrounding it is where head members of the coven would stand to imbue the ritual. While the leader would stand in the center performing whatever act. Be it Sex Magik, Child Sacrifice, Cursing, Blessing, ect. The "Mosque" is actually a masons temple. Masons and Islam share many similarities. Like the Shriners. You can tell its masonic by the blue and the gold. Both symbols of lucifer.
Notice the sun, 4 pillars and square is this picture.