Atheists say that there are natural explanations for the demonic: sicknesses once attributed to the demonic, even by the Bible, have natural causes. The Bible, however, distinguishes between sickness and demonic possession and recommends medicine for the treatment of natural sickness [1 Timothy 5:23]. Similar effects do not prove identical causes. There is at least some demonic activity which shows distinctive spiritual characteristics not present with natural sickness. Belief in a personal Satan does not entail intellectual inferiority. Those who use this argument could arguably have been deceived by Satan, who disguises himself as an angel of light [2 Corinthians 11:14].