A Christian rock artist is taking on a new mission to combat biblical apathy in believers.

After more than two decades on stage, Skillet's John Cooper has released a new book through which he hopes to fight the cultural relativism influencing faith today, CBN reports.

"We have gotten so scared about saying things that are true that it has caused a crisis," Cooper says in a podcast interview.

"It has caused a crisis of people believing that they are good and that they can reach heaven without Jesus’ help."

Awake and Alive to Truth: Finding Truth in the Chaos of a Relativistic World is Cooper's most recent step in his vocal advocacy against societal issues affect the faith of believers.

The lead vocalist decided to use his pipes for advocacy after he began to see friends struggling with their faith and making comments that he says didn't fully align with truth of the Bible.

"I don't think Jesus is the only way," was one such comment that brought Cooper distress.

Cooper's fear of the watering-down of Christianity led to the mission he has now embraced -- reminding the world of the real biblical truths of God.

"There is chaos happening for a reason and we need to be bold about what those reasons are ... If you just ground your life in the truth of Christ, you can escape all of this chaos," Cooper says.

The fear of relative truth, where people begin to question whether anything can be really said to be fully true, is one trend Cooper wants to break.

"Relativism is something that Christians cannot believe," Cooper says.

"We are in war where the church is losing so much ground within the church … the church is not looking like Christianity anymore."

The Christian rock artist is not fazed by the fear of losing the admiration of those around him, either.

"What we are losing is so great," he says.

"If it costs me fans, we have to start trying to save as many as we can. It’s that kind of a time."