Can you show any evidence where Satanism specifically drives this defendant toward criminal acts?
It would seem to me that someone who is a "Satanist" is someone who already had come to the conclusion that they belong in hell. Square peg in a square hole.
Assuming that you are 100% accurate in your mind reading and can show evidence to prove it, exactly what criminal statute does concluding that you belong in Hell violate?
Mind reading? Blow it out!
It doesn't take a mind reader to realize that someone who truly considers themselves a "Satanist" is a blithering moron, right to the core of their soul. Not to mention the fact that they're not trustworthy in the slightest way around innocent and virtuous people.
In addition, proof of the existence of Satan is proof of the existence of God, while the converse is not true. So those who believe in Satan also believe in God, and then they make the obvious wrong choice, and they make it on purpose. I have no sympathy.