imho….this is one of those verses and concepts that just cannot be taken literally because people will ask for material things and for sure Jesus was smart enough to know God is not going to give us money, houses, cars, airplanes, and nuclear bombs. (I’m sure there would be some who would ask for at least one little one. lol.) In His time, His people were suffering under Roman oppression, and they’d obviously want to have faith that God would remove their oppressors immediately, if not sooner. But, obviously, Jesus didn’t mean have faith and the Romans would disappear. So, what did He mean? For me, have faith in Him, His teachings, His doctrines, His attitudes, His concepts about the meaning of Life, life’s purpose, the nature of the soul, God, Jesus as Judge, Heaven and Hell and Judgment Day, and what we have to do to be permitted to enjoy Eternal Life with God the Father in Heaven, even on Earth. To start to understand and accept the above, I think He was saying, we must start with a little faith the size of a mustard seed, and then nourish it. Later, the most incredible miracles caused by faith will happen to us.