What you are saying is that Gospel is about behavior modifications. I would say that these behavior modifications may be byproducts of receiving the Holy Spirit! The true Christian Gospel is about the restoration of the Holy Spirit that was lost in Adams & Evens due to their choice of eating the fruit from the Tree of Knowledge of Good & Evil! God said that the moment they ate the fruit, they would DIE!!!!!! This death is a spiritual death that separated us from our relationship with God. It is through Jesus's resurrection from death that we have received Jesus' resurrected Holy Spirit which we are made permanently alive again with permanent Holy Spirit in us. Our relationship with God is based on the Tree of Life / Life of Jesus, not based on the Tree of Knowledge of Good & Evel / Laws or any rules or regulations. For anyone who desires to go back to having relationship with God basing on the Laws or Rules & Regulations is an ungrateful belief that they don't need Jesus but they want to go back and keep on practicing the Law (the erroneous Work Based Salvation) which does not lead you anywhere except death, Hewbrew 10:10.