Jesus said that you must believe and be baptized to be saved. What that means is, in order for us to experience salvation (Heaven on Earth) you must do a couple things: believe and be baptized. To be baptized in something means to be immersed completely. Many of us us believe what God says is true, but we aren't experiencing the fullness of the Kingdom because we only have an intellectual understanding of it all. Immerse yourself in the truth of the gospel and salvation will manifest itself in your life.