When I was 17,I had this phase where I listened to music that had extreme anti-christ and satanic content (black metal from Norway).At that time,Satan did fascinate me for a short period.I read a lot about and viewed a lot of Satanic art.You should read about stories and performance arts of bands like Mayhem,Burzum etc,its fascinating how evil they can be!
But welp,never legitimately believed in the existence of Satan.