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Ho-boy! This is something I'm going to reply to piece by piece.

First of all, putting the name of "Wicca" aside, if he's just starting to learn anything he should not be doing the kinds of "conjorings" than can cause a person to black out. In fact, its my opinion that beginners in witchcraft shouldn't really be attempting any conjorings or invokations at all until they have a handle on themselves and know what they're doing and why.

Secondly, if he is doing this alone and without the aid of a coven, it is not Wicca.
If he is under the age of 18, it is not Wicca.
If he has been studying this for less than a year, it is not Wicca.

I could go on, but the name "Wicca" is not the issue here.
This is when you strongly urge him to seek psychiatric help. If he is under the age of 18, talk to his parents, if he is 18 or older talk to him and try to convince him to go in for some sort of counseling or consultation. That wasn't the real problem? Ho-boy!

Uh... ah... hm... That's... almost flattering of him in a delusional "I'm living in an anime" sort of way. Did he say what it was they caused him to believe this? Was it the voices? Was this belief before or after he black-out? Has he read, seen or been exposed to any books movies, TV shows or other media with a similar theme? Does he include himself in that? Or is he also not human now? Once again, I suggest trying to get him to go in for psychiatric help. If his "voices" keep telling him to kill and he is convinced that you are not human and that all humans are terrible then he possibly be a danger to himself and others. You cannot commit him to a psych-ward unless you can prove that he is dangerous, however, you can bring him in for counseling and try to convince him to cooperate.

If your father is physically abusive, report him to the police. If you have bruises or other injuries from him, show them to the police as proof and report him. The police take domestic abuse cases VERY seriously. They are there to help you, use them. Does your mother live with you? Does he abuse her too?

The police can help both of you, as I said, they take domestic abuse cases very seriously and will try to get you (and you mother if she's with you) away from your father. Never hesitate to call the authorities when it comes to abuse! NEVER! If you can find an out then GET OUT! If he is dramatically different from how he used to be then may I ask what else is going on in his life right now? Has anything drastic changed in his home-life? Have his parents gotten a divorce? Has there been a death in the family? Has be started doing drugs? has he received any recent injuries? Has he been medicated recently?

Please remind him that if he murders your father or attempts to murder your father is will only destroy his own life and not help you in the slightest. If your father is abusive then what he needs to do it take you down to the police station and report the creep. That is how he can protect you. Killing is not the answer.

Seriously: seek a mental health professional. Since it seems that you're both under age, can I assume you are still in school? Do you go to the same school? Do you know who his student councilor is? Does your school have permanent councilors or does the district only have a handful of councilors that travel from school to school?

When you can, visit HIS student councilor and ask her advice on how to go about getting him some professional help. Make it clear to her that you do not think he's just playing and that you are truly frightened for him. As her what you should do. She probably won't tell you anything right away, she will probably want to speak to him first. After she does she should get back to you on what you should do. If she does not contact you, you need to follow-up for her.

But remember: She cannot share what they talked about with you because of the confidentiality rule she is under. However, if she is convinced that he poses a danger to himself or others then she is required by law to alert someone. (That someone will not by you, BTW.) But she will tell you whether or not its being taken care of or if its nothing and you shouldn't worry about it, or if it needs more attention before she can make a decision.

That is the first step.

After that, if he goes to counseling but does not improve or gets worse, that is when you go to his parents and ask if their medical insurance covers therapy and/or psychiatry. From the sound of it, he will need psychiatry. Once again, make it clear to his parents that you are very concerned for his well being and that he scares you sometimes. Say whatever you have to in order to convince them to get him help.

From that point on, it might be out of your hands. But that's about all you can do short of driving him to a mental hospital or psych-ward within your local hospital yourself.

I will not tell you what to think, I can only tell you how I think you should act based on what I have read (which I have already done.

It could be possible that he's lousing his mind.

Or, he could just be making it all up for attention. How does he act around other? At school? With his parent? With your parent? etc.

He does sound very fluffy with the whole "Wicca" thing, but that is a very tiny issue when compared to everything else you described.

As for your "spirit" theory... eh, I highly doubt it. The first two explanations are far more likely. He's either making it up for attention or he's lousing his mind and need help.
I hope you found this helpful. If you have any more questions, please do not hesitate to ask. That is what this guild is here for.

I'll get him some help as soon as possible.

I did..just out of curiosity, and he said it was the greek goddess of death and insanity, Mania.
That's when I knew he was crazy because a simple guy like him would have no way of knowing Mania of all the greek gods and goddesses.

Mania is not a greek goddess of death. It looks like they are Maniae, plural, being spirits of madness. Though the sources aren't always clear on that.

I would not recommend taking him to a counsellor by yourself because he may react in a negative fashion; you'd be in a much better position if you gave his parents the money and let them take him. It's very important that you express your concerns to his parents directly because he may need immediate psychiatric help.