In Judaism, Satan is God's district attorney, while God himself, is the judge presiding. Jesus, in Christianity, is humanity's defense attorney.

In Hinduism, there is no concept of "Satan" BUT, there is a concept of a duality of the one God Vishnu. Vishnu is the all wise incarnation, while Kali, godess of destruction, is the evil incarnation of Vishnu.

In Zoroastrianism you have Angrya Mayu, and Ahriman, twin brothers of the supreme God. Angrya Mayu is creator of humanity, and all things beautiful in nature. Ahriman is death itself, and creator of all evil things in nature such as frogs, flies, mosquitos, sharks, etc. Zoroastrians explain that not all animals are friendly to human kind, because some animals were created by the demon Ahriman, to torment us. In fact, because of Zoroastrianism, there are no more wolves in Iran. Wolves, used to have a wide range, from Europe, over Russia, into the Caucasus, and heck all the way to India, over the Himalayas and even into China. However, the Persians among other cultures hunted them down ruthlessly, and with the exception of the forests in Russia, wolves in Eurasia are largely extinct. Now only Siberian timber wolves are alive. In Persia, because of that Ahriman story, they were wiped out outright because wolves in particular were thought to be servants of the demon Ahriman.

Wolves are ultimately just canines, and like all canines if you spray them with mace they won't attack you. I mean, if they're snarling at you and all that. Mace seems a little cruel, considering how sensitive their noses are but it IS better than just blowing their heads off with a shotgun. Take your pick; its you or it, your life is valuable, and you can either spray it with mace to preserve your own, or shoot it. So anyway...

Daoism does not have a concept of a "satan." There is balance, which is good, and there is inbalance, which is evil. Evil in Daoism is defined as extremes, as inbalance of any sort. Too much poverty is not a good thing; you are sick, you are cold, you have no home, and you are starving. Too much wealth is not a good thing; you are paranoid and angry all the time, and all the money makes you miserable.

Too much materialism is not a good thing because the more crap you own, the more headaches you'll have. Too little is not a good thing, because come on, you need clothes. Thus, a person lives with only the most rudimentary needs, and lives as comfortably as possible, but with as little luxuries as possible, emphasizing needs over wants.

Daoism says, balance is "good," but unbalanced extremes, are "evil." So, if there was to be a concept of a devil in Daoism, it would probably be chaos and entropy personified in some form. Chaos, as in extremes of all things, and absolutely no balance.

Finally in Buddhism there may be many devils, in fact, some devils in the hells of Buddhism are a lot nastier than the Christian devil. In fact, there are devils in Buddhism that make the christian satan look like a virginal yeshiva orthodox jewish boy. No joke; many Buddhist devils, could take the christian Satan to school. According to the story they are really nasty, scariest of all of them being king Yama, judge of the dead.

Every religion has the concept of a supremely powerful evil being.

I'm personally open to the idea; the human world has it Hitler's, its Stalin's, and its Natalie Portman's and Scarlett Johansson's, so it stands to reason that the spirit world would have a "Satan."

You have heard SJ sing right? Given her viking heritage, her singing is the harbinger of Ragnarok! Also her viking heritage makes it so that she has had multiple sex partners, I mean after all you know what wild parties those Vikings threw, its in her blood, after all.

hope my answer helped.