Paul deals with sin's problem in Romans. It may be overcome when persons die to it through "the body of Christ" (Rom 6:4). Here, "the body of Christ" may be understood as Christ's crucifixion. In other words, through the way of Christ who lived faithfully to embrace the love and justice of God, one can live away from sin or its power. Otherwise, Paul never says that Christ's death alone resolved sin's problem. Rather, Paul's logic is because Christ died, all who follow Jesus have to die with him. Then sin's power will be dismissed. Paul says in 2 Cor 5:14: "For the love of Christ urges us on, because we are convinced that one has died for all; therefore all have died." For more see Rereading Romans from the Perspective of Paul's Gospel or Rereading Galatians from the Perspective of Paul's Gospel. Jesus's death is the result of his faithful obedience to God, which means the cost of demonstrating God's righteousness (Rom 3:22). Also, see my latest book: How to Read Paul.
The Johannine Jesus is portrayed highly as close to divine. But the Fourth Gospel never claims that Jesus is God. Rather, Jesus says the one who sent him is greater than he. Also, he always makes it clear that he does the work of God. He does not do his work. His primary identity is the Son of God. Even when he says "the father and I are one," this does not mean that he is the same as God. It means "union" relationship between the two. If I say our family is one, it does not mean all members of my family are the same. The point is our family is united with the same love and solidarity. In the Fourth Gospel, there are lots of "embodiment" language by Jesus that can be understood metaphorically as his living of the Logos. That is, he embodies God's love in the world. "I am" sayings of Jesus, accordingly, must be understood as the description of his work, rather than as signs of his divinity. For more, see my book: Truth, Testimony, and Transformation.