I was going to compose and post an elaborate explanation, but I'm uncomfortable sharing a spotlight with this type of religion:
http://www.bloginservice.com/cgi-bin/webbbs/webbbs_config.pl/read/4924
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When you are come into the land which Yahweh your God gives you, you shall not learn to do after the abominations of those nations.
There shall not be found with you anyone who makes his son or his daughter to pass through the fire, one who uses divination, one who practices sorcery, or an enchanter, or a sorcerer,
or a charmer, or a consulter with a familiar spirit, or a wizard, or a necromancer.
http://bible.cc/deuteronomy/18-11.htm
For these nations, that you shall dispossess, listen to those who practice sorcery, and to diviners; but as for you, Yahweh your God has not allowed you so to do.
http://bible.cc/deuteronomy/18-14.htm
Yahweh your God will raise up to you a prophet from the midst of you, of your brothers, like me. You shall listen to him.
http://bible.cc/deuteronomy/18-15.htm
And it shall come to pass, that whosoever will not hearken unto my words which he shall speak in my name, I will require it of him.
http://bible.cc/deuteronomy/18-19.htm
Only, the prophet who presumeth to speak a word in My name -- that which I have not commanded him to speak -- and who speaketh in the name of other gods -- even that prophet hath died. (YLT)
http://bible.cc/deuteronomy/18-20.htm
When a prophet makes a statement in the name of the Lord, if what he says does not take place and his words do not come true, then his word is not the word of the Lord: the words of the prophet were said in the pride of his heart, and you are to have no fear of him. (BBE)
http://bible.cc/deuteronomy/18-22.htm