The biggest blunder that people make in trying to understand word faith, is that they assume the teaching suggests that Christians have the authority to make God do something, simply by using the power of spoken words. Just read a couple of the links that our new friend posted further up. Hanegraaf makes this mistake quite glaringly.
It's a subtle error, but it's quite a significant one. If the teaching of word faith suggested that people can make things happen by the power of their own words, this would be a claim to deity (gods / little god etc). Or at the very least it would disregard God's sovereignty, as nothing can happen except by God's will.
People cannot do anything at all based on their own power or authority, and no one can cause anything to happen other than God.
So what is word faith?
It's simply the understanding that we should speak to situations using authority that is already ours inherited in Christ. If we know that the things we require are according to the will of God, we know we have them when we ask for them.
And so it is not a matter of forcing God to move, but accepting what God has already done, and acting on it in faith.
It's similar to when a person is saved. Paul said, "if you confess with your mouth the Lord Jesus, and believe in your heart that God has raised him from the dead, you shall be saved". The person isn't saved when he says it, but because he says it in faith, it becomes so.
Are we forcing God to save us when we confess salvation? No
We're claiming for ourselves what God has already done.
Again it's similar to switching on a light. Are you forcing the energy provider to produce light? No
You're putting a demand on the energy that has already been provided.
Mark 11:23 "For assuredly, I say to you, whoever says to this mountain, ‘Be removed and be cast into the sea,’ and does not doubt in his heart, but believes that those things he says will be done, he will have whatever he says.
Does Jesus say that we can make God move mountains? No
Jesus said that the mountains will obey us, not God.
If we know that what we ask is in accordance with God's will (his word), we know we can have what we say (1John 5:15) once we learn to deal with doubt and unbelief.