the most blatantly supernatural thing that i have ever personally experienced is having two separate scripture references come to me in a dream. they were not passages i was familiar with, and they both had one particular phrase repeated word-for-word which was relevant to an issue i was facing at the time. this was last december.
thus i know that the God i believe in is real, alive and active, although i may not see it at this particular moment.
what Jesus said was, "even though you do not believe me, believe the miracles." miracles are not crucial to faith, but they help.