Seeing is not necessarily believing. I believe in Jesus yet do not believe that I have witnessed a genuine miracle. Others claim to have observed miracles yet do not remain faithful. The Lord pronounced woes on the titles of Chorazin and Bethsaida for their citizens' lack of proper response to the miracles performed there (Matthew 11:20-22).
A lot of us, as with Thomas, exclaim, "Show me!" I get heartsick at the emphasis upon the supernatural by religious showmen on those electronic religious programs. "Expect a miracle! Pray for God's miraculous healing! A miracle a day keeps the devil away." All of this is just so much delusion.
It is a wicked spirit that always expects miracles. It is an adulterous generation that demands that God heal and prosper. God's people today live by faith and not by sight. We have no right to expect (much less demand) miraculous signs of God's presence and involvement in our lives. If we cannot see the Lord's signature everywhere in his creation then we are spiritually blind and could not see a miracle if one were performed before our eyes.
Jesus and his apostles performed signs and wonders that could not be denied, yet he and they were rejected and killed. Eyewitness accounts do not guarantee one's faith in God. The Israelites were witnesses of the Red Sea crossing. But they soon forgot and lost t heir faith. If you must have a miracle to believe in Jesus then you are living by sight and not by faith. You'll need frequent miracles to sustain your faith.
Believe! "Because you have seen me, you have believed; blessed are those who have not seen and yet believed"(John 20.20). - Steven Clark Goad