1. Their lyrics are often about their faith in God. For example, the song "Awake and Alive" contains the lyrics "I'm awake and alive / I'm gonna praise Your name / I will not be afraid / 'Cause You are here with me."
2. They have been open about their faith in interviews. For example, in a 2016 interview with CCM Magazine, lead singer John Cooper said, "I think our faith is a huge part of who we are as a band. It's what drives us and motivates us to do what we do."
3. They have performed at Christian events. For example, they have played at the Rock the Desert festival, which is a Christian music festival.
4. They have been endorsed by Christian organizations. For example, they were named "Band of the Year" by the Gospel Music Association in 2008.
Based on these reasons, it is clear that Skillet does act like a Christian band.