My brother in Christ,
Please read John 8, as it particularly applies in your brother’s case:
[The teachers of the law and the Pharisees brought in a woman caught in adultery. They made her stand before the group and said to Jesus, “Teacher, this woman was caught in the act of adultery. In the Law Moses commanded us to stone such women. Now what do you say?” They were using this question as a trap, in order to have a basis for accusing him.
But Jesus bent down and started to write on the ground with his finger. When they kept on questioning him, he straightened up and said to them, “If any one of you is without sin, let him be the first to throw a stone at her.” Again he stooped down and wrote on the ground.
At this, those who heard began to go away one at a time, the older ones first, until only Jesus was left, with the woman still standing there. Jesus straightened up and asked her, “Woman, where are they? Has no one condemned you?”
“No one, sir,” she said.
"**Then neither do I condemn you," Jesus declared. “Go now and leave your life of sin.”]
Rather than a hinderance in returning to the faith, such sin is more akin to a requirement-because Christ came not to call the righteous, but sinners. If this does not provide total hope, then what will? Christ is waiting to mete out just such mercy-since he IS mercy.
Christ’s peace to you and your brother.