The Jesus they refer to is usually popular with unsaved folks, which is the first sign that he isn't the real Jesus (John 15:18). He doesn't talk about sin, judgment, or hell like the real Jesus does (Matthew 18). He doesn't say he is the only way of salvation like the real Jesus does (John 14:6). He doesn't say what the real Jesus says about obedience and love (John 14:21-24).
Unfortunately, many Christians also have an incorrect view of Jesus. They believe He's pleased with them no matter how casual their faith is. But Jesus is clear:
“If you refuse to take up your cross and follow me, you are not worthy of being mine... All who love me will do what I say." Matthew 10:38; John 14:23 NLT
Let's read our Bibles and make sure we know the real Jesus! He loves us too much to be satisfied with a watered-down faith.
Another devotion that discusses this truth is "Another Jesus."