Some Christians take every situation and claim "God did this" or "the holy spirit is moving in this place" when something good happens, and "Satan did this" or "this place has evil spirits" when something bad happens. Sometimes you even hear "God did this out of anger/jealousy" when something bad happens (see natural disasters).
The Bible shows countless times where God intervenes (see the plagues in Exodus) and also where evil spirits intervene (see demon-possession in Matthew). Ultimately God is in control, but how can one determine if a situation occurred due to divine intervention?