No, the context is Jesus demonstrating his authority over the fig tree, using it to teach the disciples an object lesson about fruitfulness. He also had a lesson about faith, but he never said that God was obligated to to grant a desire because you believe you will get it. Your desires have to match up with God's desires in order to rightly expect that you will get what you prayed for (James 4:3). If you are not 100% sure, then don't say he "will" get it. It's not promised. Forgiveness of sins upon repentance is promised, you CAN be sure of that. Expecting something of God that he never really promised you is a terrible trap that the enemy uses to wreak havoc on people's faith. I've seen it, it's far from pretty.