Jehovah's Witnesses have a faulty understanding of the doctrine of Justification as is clear from their flawed translation of Luke 18:14.
"And everybody got the question: If God's so good how He let this happen? Is it mental health? Is it gun control? . . ." . . . Romans 1:18-19.
We are commanded to "always be ready to give a defense to anyone who asks you for a reason for the hope that is in you.” . . . 1 Peter 3:15.
When we are faithful and preach the gospel, it is God preaching the gospel through us. . . 2 Corinthians 5:20.