And when the men had come to him, they said, "John the Baptist has sent us to you, saying, 'Are you the one who is to come, or shall we look for another?'" In that hour he healed many people of diseases and plagues and evil spirits, and on many who were blind he bestowed sight. And he answered them, "Go and tell John what you have seen and heard..." Luke 7:20-22 ESV
Our God's a big God. He can handle doubts and questions. And, though He doesn't have to, He doesn't mind proving Himself to us once in a while.