Being a witch is an earth based religion that has many paths. Generally we believe in individual male and female aspects of Gods and Goddesses, rather than a one-sided male God. However, these may be from Norse , Greek, Egyptian or local Gods and Godesses.
The Term Wicca was introduced during the revival of the craft, and stems from the two main covens of that time. Essentially you cannot be a true wiccan if you are not initiated into these or decendants of these.
There are many witches who are solitaries, that work on their own by different means, and do not abide by wiccan rules. This does not make them evil, as nature is not evil - but balanced.
Any form of divination or spell work was demonised by the church as late as AD500, and up untill the repeal of the witchcraft act, was punishable usually by torture and death. So you understand the church likes it's power to control people.
No, we don't believe in Hell. This is a christian concept only.
We do believe there is a resting place for our soul though, and most believe in reincarnation.
As for Christians saying "believe in our god or you will burn in hell" it's like us saying "Believe in our God and Goddess or you wil become barren, see your family die out and your dust scattered to the four winds" - but we don't curse people for no reason. It's just not nice.