Bill Johnson has a warm and likable personality, and he comes across as a knowledgable and godly man; but beneath his charming personality is a specific theological viewpoint that must be evaluated (just like any pastor). The Bible has a lot to say about the importance of good doctrine and the necessity of confronting false teachers.
Here are a whole bunch of articles from different Christians from various theological and denominational backgrounds who all agree on the very un-Biblical and downright dangerous beliefs of Bill Johnson:
Bill Johnson is a major leader in the New Apostolic Reformation.
Bill Johnson teaches a form of the Word of Faith doctrine.
Bill Johnson does NOT want you to know about The Charismatic Day of Infamy.
In the following Bill Johnson/Bethel Church memes, notice the emphasis on how important we are, and how the Christian life is not centered around worshipping Jesus, who died on the cross to pay the penalty for our sins (that is never mentioned), but instead it's a Word of Faith/Dominionist/Gnostic belief system, with a little bit of Chinese fortune cookie theology thrown in to tickle itching ears. Also, notice how many of these sayings directly contradict the Bible and don't even make sense (click the photos to view):