Satan wages a constant war against God, to get people lured into and trapped within false systems that do not worship the true God, but some abomination claiming to be God. All false religions are essentially identical at their core. They just have different names and different rites and ceremonies, but at their core, they are systems that focus on imagined deities, and teach that man can save himself by his own efforts, his own achievements, and his own self-righteousness, and that the way to god, is through ceremony, ritual and rites.