Why is all sorts of magic used in the religion Voodoo?

i mean why is black magic and voodoo dolls associated with this normal African Religion ??

African Voodoo does not have any dolls, this is a Haitian thing. In Western Africa, there are several different branches of Voodoo, such as Wodu Xevie, Wodu Da ET TeraRa they do not really have that much in common with what people think of while thinking of "Voodoo". I think it's the media who made it stereotypical image out of it.

Some religions think you can ask gods and receive reward, and some other believe you have to do your half of the work. I respect the latter more, a religion where humans have power seems much more healthy than one where you beg, beg, beg.

Edit:
Also what Lev said. I focused on why and didn't assess the stereotype VS reality angle, but what she says is true.

Check this out using your own Bible then you will know for yourself what you need to avoid and why:
Who Dwell in the Spirit Realm?
A basic question in the quest for spiritual understanding is this, Who inhabit the spirit realm? While most modern witches are followers of a nature-oriented, polytheistic faith, some worship a great mother-goddess, viewed in a triple role of maiden, mother, and crone, representing the basic stages of life. Her lover is a god with horns. Other witches worship a god and goddess together. One writer says: "The Goddess and God are seen as a manifestation of the feminine and masculine forces of nature. Each [having] unique characteristics that when combined result in the harmonious creation of life." Another authority writes: "One of the most pivotal choices in Witchcraft is your choice of the deities (Gods/Goddesses) you will work with. . . . The Craft gives you the freedom to pick and subsequently honor your own forms of the Divine."

The Bible supports none of these ideas. Jesus Christ devoted his entire ministry to teaching others about Jehovah, "the only true God." (John 17:3) The Bible states: "Jehovah is great and very much to be praised, and he is to be feared more than all other gods. For all the gods of the peoples are valueless gods."?1 Chronicles 16:25, 26.

What about the Devil? Webster's Ninth New Collegiate Dictionary defines witchcraft as "communication with the devil." It would be hard to find a witch today who would agree with this definition, for many do not accept even the existence of Satan the Devil. One young woman, described in The Irish Times as a "high-ranking witch and leader of one of Ireland's most significant covens," reasons this way: "Belief in the Devil implies acceptance of Christianity . . . [The Devil] cannot inhabit a universe where there is no God."

The Bible confirms the existence of the Devil and charges him with much of the suffering and turmoil on earth. (Revelation 12:12) Jesus not only taught that the Devil exists but also showed that it is possible unwittingly to do the will of the Devil. For example, self-righteous religious leaders of the first century asserted that they were, in a way, sons of God and believed that they were doing the will of God. Jesus, who could discern what was in their hearts, knew differently. He told them forthright: "You are from your father the Devil, and you wish to do the desires of your father." (John 8:44) Further, the Bible book of Revelation states that the Devil "is misleading the entire inhabited earth."?Revelation 12:9.

Is Some Magic Good?
Magic, of course, has always been associated with the occult.* Many people in both ancient and modern times believe that the magic practiced by witches is performed to bring harm to others. Witches are credited with the power to inflict severe pain and even death by means of magic. Traditionally, witches have been blamed for an almost limitless array of misfortunes, including illness, death, and crop failure.

Witches today strongly deny such charges. While acknowledging the existence of the occasional rogue witch who pursues evil, most maintain that their magic is used to bring benefits, not harm. Wiccans teach that the effects of magic will return threefold to the person practicing it and say that this is a major deterrent to the pronouncing of curses. Examples of this so-called benevolent magic include spells to protect yourself, to purify your home from negative energy left behind by former tenants, to make a person fall in love with you, to promote healing and health, to prevent the loss of your job, and to acquire money. With such sweeping powers being attributed to witchcraft, it is not surprising that it has become so popular.

Magic has always been associated with the occult
The Bible, however, makes no distinction between magic that is good and magic that is evil. In the Law given to Moses, God made his position quite clear. He said: "You must not practice magic." (Leviticus 19:26) We also read: "There should not be found in you . . . a practice of magic or anyone who looks for omens or a sorcerer, or one who binds others with a spell or anyone who consults a spirit medium."?Deuteronomy 18:10, 11.

Why did God say that? It is not because he intends to deny us what is beneficial. Jehovah gave these laws to his people because he loved them and did not want them to become enslaved by fear and superstition. Instead, he invites his servants to approach him for the things they need. He is the Giver of "every good gift and every perfect present." (James 1:17) The apostle John assured fellow believers: "Whatever we ask we receive from [God], because we are observing his commandments and are doing the things that are pleasing in his eyes."?1 John 3:22.

Are practice rs of witchcraft unknowingly doing the will of the Devil? What About Evil Spirits?
Many witches agree with the Bible on this point: Evil spirits do exist. In one essay a prom