OP, yes, becoming a faithful disciple of Jesus Christ will radically change your life. Of course you can become a so-called "Christian", believe the basic doctrines, live in mortal sin and still lose your soul. St. James said in scripture (I paraphrase), 'What good is faith without works? Even the demons believe!' A call to Christ is a call to holiness, to "work out your salvation in fear and trembling" before holy God. To "store up treasure in heaven" as Jesus says. It is by serving Christ through the obedience of a faithful and virtuous life that we acquire a "weight of glory" in paradise, where God Himself is our reward.