What an inaccurate and disgusting mistranslation of that verse! May God properly punish you for deceiving people and making them feel that the reason they're not healed is their lack of faith! Show me the people who've had healing miracles!
NO, we won't be miraculously healed if we just have enough faith. That's happened for NO ONE. Jesus was talking to someone about performing a miracle for them. Jesus doesn't perform miracles anymore. He hasn't since he ascended into heaven.
RE: Mark 9:23