The Bible on False Prophets
If a prophet speaks in the name of Allah or Baal or Vishnu, you can be assured that he is a false prophet.
If a prophet tells you that you can be saved by putting your faith in Mary, the mother of Jesus, you can be certain he is not a spokesman for God.
If a prophet lives a sinful life, his prophecies are to be doubted.
If the prophet's followers are motivated to worldly living, the prophet does not speak for God.
If the prophet focuses on personal visions with sensational insights (visits to Heaven or Hell, for example), his words are to be distrusted.
If the prophet never issues a call for repentance, he is to be suspect.
If the prophet operates in a manner that makes it appear that his greatest interest is money, he is to be avoided.
If a prophet tries to bring attention to himself or focuses on the Antichrist or the sensational, he is to be questioned.