I am definitely a believer, and I see the miracles of God every day. I have only to open my eyes and see the wonderous world He has made and admire the beauty of His creation.
I also know that He works His will according to His desires. He gave us all we need in order to believe. Now that scripture is the authority in our lives, we no longer need men walking around telling us what new revelations God is giving to us. Those revelations are now complete - in scripture. Nobody has to now prove that He is empowered by God to speak for Him - so we need no miracle workers.
God can still heal when it fits His plan - can still grant people with the ability to give the message in someone else's tongue. He, however, no longer needs to give those gifts as a sign for the people to know who to believe. We don't need to believe any man now - we have His Word.
I can believe without seeing God prove Himself or show his empowerment of any man as His prophet. This world needed those at one time, but not now.