Is slayer really satanic?

Dear All Metal Madmen,
I am much crazy about metal especially The Big 4 .I love Slayer and
Tom Araya among the Big 4.Many lyrics capture my soul,but still doubts
remain.I dont believe in any organised religions but believe in a non
personal god.
Though Slayer deal with "Dark" subjects such as
Satanism,Necrophilia,violence.....etc.Many claim that they are not
Satanists..!!.Is this really true?.My mind says that a nice person
like Araya cannot be a Satanist but still evidence spoil the same.
Tell me Slayer members are atheists?.Non religious like me?Or still
they religious?.Whats reality?>pls guide me mates.
Thanks