Satan desperately wants to say that God isn’t big enough. He can only redeem certain kinds of people. He can only fix problems with a certain degree of difficulty and no more.
Satan rejoices to see a church where only certain people feel welcome. If its members can handle only one kind of music, he likes that.
Satan enjoys it when Jews or Muslims or Buddhists or agnostics can convince themselves that Jesus isn’t for them. He enjoys it even more when Christians agree with them.
Satan is ecstatic when a church can’t provide healing for emotional or social hurts, and must send its members to experts who aren’t even part of the church.