Ok, I'm impressed by your courage to ask such a bold question. The simple answer for why people hate her is probably because she came mainly from the Disney Channel, and most people don't like the somewhat instant fame that goes along with that. Another reason is because not everyone likes her music. Simple.
I don't really think Miley could kick peoples asses just because they don't like her - she'd get sued or something. What I don't like is when people seem to think jealousy is the reason behind all this hate. There are actually very few haters who are jealous. And may I just ask why you are calling people who don't like her "devil kids/teens/adults". That's like saying that if you like Miley Cyrus you must be an angel, or something similar. I don't think that oppression has anything to do with not liking one particular artist. I agree that if you do become successful there will always be haters, but that is the case with anyone. Take bands like My Chemical Romance [just as an example] and many other rock bands. They seem to insite hate from many other people, through no fault of their own. They have done nothing, it's just people who don't like their music. It's as simple as that.
May I just say that I am shocked at the fact you bought the Jesus into this argument. Miley Cyrus cannot compare to Jesus in any way shape or form. I also don't really like the mention to the KKK, Nazi's or gangs. Those things are terrible, and yes I know they do have some followers for some strange reason, but I don't see how bringing them up is relevant to the question. They terrorize(d) the world and should not be mentioned so flippantly. Anyway, that's beside the point.
Most people don't like Miley because she came from the Disney Channel, most of her initial support was because of her family name, and the fact that her music just isn't for everyone yet many of her fans constantly try to convince others to like her. She's not that great that she can change everyone, not even Jesus could convince everyone of his message.
However I do applaud your nature to stand up for and defend what you believe in *claps* Well Done. Oh and yeah, your grammer is kinda messed up.