You Must Know Jesus
You can be very religious and still not know what you worship. You could be attending church your whole life and still not know Jesus. Not because you go to a church where they talk about Jesus makes you into a Christian. You may attend a church and know the rituals, practices and still not know Jesus.
Jesus himself said that at the end of times, there will be people that have a form of religion, people who thought knew Jesus or had a relationship with him. They will be shocked to find out they will not be with Jesus.