Well, believe it or not (heehee), the Advance Class, on pages 26 and 27 of the silly-bus, gives some answers to this question.
It seems that this kind of believing is the kind that comes from the renewing of the mind and is used to operate the law of believing.
It's not the same as the manifestation of Believing, which is an impartation manifestation.
"The manifestation of Believing is your operation of the God-given ability whereby you may believe to bring to pass the impossible at your command according to what God has revealed to you by Word of Knowledge, Word of Wisdom and Discerning of Spirits. It also inspires believing in others."
Now take your Sing Along The Way books and turn to "It's Only Make Believe".