While believing in Jesus gives hope, Christianity is not based on hope or blind faith. It's based on evidence.
The first of Jesus' miracles that John documents is when Jesus–with a nudge from his mother—attended a wedding and turned water into wine. It was the first sign of many that gives evidence of who Jesus is.
Just outside of Jerusalem, Jesus performed a miracle that changed a man’s life forever. For 38 years, this man was unable to walk. But when Jesus said, “Get up,” the man was healed. However, it’s what Jesus said next that made this miracle a clear sign of who Jesus really was.
Perhaps one of the most famous signs performed by Jesus is feeding over 5000+ people with five loaves of bread and two fish. Those that followed Jesus thought he was finally getting to the point of what he could do for them. They were more enamored with the signs instead of what the signs were pointing to.