1) Just going to church does not make someone a Christian. 2) Vaguely believing in God does not save us. 3) Being baptised, as a baby or as an adult, does not make you a Christian. 4) Coldly giving a mental accent to Jesus will not get us to heaven, 5) The Bible tells us what makes a Christian and how to become one: "If you declare with your mouth, ‘Jesus is Lord,’ and believe in your heart that God raised him from the dead, you will be saved. For it is with your heart that you believe and are justified, and it is with your mouth that you profess your faith and are saved." (Romans 10:9-10 NIV)