According to some people, and their interpretation of the Bible, Jesus is a lying, manipulative, conniving, deceitful fraud.
They must mean this because they say that Jesus was not who He claimed to be, what He said about life and death was not true, and that generally, if He existed at all, Jesus was just a guy like you and I.
Jesus makes a diagnosis of the personality of people who think like that.
Titus 1:15 - To the pure, all things are pure, but to those who are corrupted and do not believe, nothing is pure. In fact, both their minds and consciences are corrupted.
2nd Samuel 22:27 - To the pure you show yourself pure, but to the crooked you come across as shrewd and deceiving.
Matthew 12:34 - “How can you who are evil say anything good. For out of the overflow of the heart the mouth speaks. The evil predilection brings evil out of the evil that is stored up in him. But I tell you that you will have to give account on the day of Judgement for every careless word you have spoken. Words can be your salvation, or words can also be your damnation.”