Matthew 11:6 Blessed is anyone who does not stumble on account of me.
John did not have the luxury of going to sit and speak with Jesus for an in-depth discussion of just who He was.
Instead, Jesus instructs John to have faith in knowing it is Him and not to stumble over disbelief on accounts of others.
Don't be discouraged by what others tell you incorrectly about God – believe in what you know in your heart after reading your Bible.