“It was because you haven’t enough Faith,” answered Jesus. “I assure you that if you have Faith as big as a mustard seed, you can say to this hill, ‘Go from here to there!’ and it will go. You could do anything." Matthew 17:20.
Sometimes, we tend to take the Bible too literally. We forget that when Jesus spoke to His listeners He used the idiom and phrases commonly used at the time.
In Britain there’s a saying “Keep your hair on”, which means calm down, don’t get so excited and worked up, relax a little.
It would be wrong if 2000 years from now that saying were interpreted to mean an adverse comment on male baldness.
When Jesus referred to moving a hill He did not mean it literally. Miracles are not magic tricks, and the Holy Spirit, for it is He who performs miracles, not the disciples, and certainly not us – the Holy Spirit would not perform a miracle for no purpose.
In this context, the disciples had failed to drive out a demon from a young child. They asked Jesus why they had failed.
Jesus taught them, and us, that a pre-requisite to performing miracles is to have Faith in Him, in God, and in the Holy Spirit.
And yes … miracles do happen in this day and age, today even.
The problem is that we are too un-willing to believe.