Does satanic worship make the person bad?
The Bible says All have sinned and fallen short of the glory of God....i don't know if they are any better or worse than anyone else...

Let all bitterness, and wrath, and anger, and clamour, and evil speaking, be put away from you, with all malice:And be ye kind one to another, tenderhearted, forgiving one another, even as Elohim for Yahushua the Messiah's sake hath forgiven you. Ephesians 4:31-32