Jesus TOLD his disciples that they would have trouble. There was no "but if you believe, there will be no trouble" or "if you believe, the trouble will vanish" or anything like that.
As has been said before, by putting the blame on Job, twi aligned themselves with his miserable comforters.
Look- trusting God, believing God, is one thing. Believing in your own believing is something entirely different. Your will be done.