So Jesus is saying if you have faith nothing (that God wants for you) with be impossible. 

What it doesn't say is 'just have faith that things will work out favorably for you, or you will get your way, or you will realize your hearts desire.' 

That is treating God like a vending machine. As long as you put the requirement in then God is required to give you what you asked for. What you want. That is a warped view of God.