One of the biggest criticisms of Christians is that we are hypocritical. Hypocrisy is claiming to have moral standards and convictions but failing to follow them. It is not a new problem. In fact there is a story in the book of Galatians about Paul confronting Peter because of his hypocrisy (see Galatians 2:11-13).
When we see hypocrisy in another believer’s life, we should speak to the person about it, but do so with gentleness and humility (Galatians 6:1).