Sin, is by definition, a rejection of God’s will. You seem to beleive that sin has no ramifications. Well, you are clearly wrong. Have you ever read the story of the woman caught in adultery (John 8: 3-11). In case you haven’t, Here it is:
Then the scribes and the Pharisees brought a woman who had been caught in adultery and made her stand in the middle. They said to him, “Teacher, this woman was caught in the very act of committing adultery. Now in the law, Moses commanded us to stone such women. So what do you say?” They said this to test him, so that they could have some charge to bring against him. Jesus bent down and began to write on the ground with his finger. But when they continued asking him, he straightened up and said to them, “Let the one among you who is without sin be the first to throw a stone at her.” Again he bent down and wrote on the ground. And in response, they went away one by one, beginning with the elders. So he was left alone with the woman before him. Then Jesus straightened up and said to her, “Woman, where are they? Has no one condemned you?” She replied, “No one, sir.” Then Jesus said, “Neither do I condemn you. Go, (and) from now on do not sin any more.”
Note, she is a sinner. Jesus saves her but he also tells her to sin no more. This in an analogy for all of us.
After you are saved (we believe this happens when we are baptized), you need to live lives of holiness to continue being saved, Just as he told the adulteress. Like her, if we return to our sins, we will no longer be saved.