The Bible doesn't attribute all illness to demons as is commonly charged.
Matt 4
Then His fame went throughout all Syria; and they brought to Him all sick people who were afflicted with various diseases and torments, and those who were demon-possessed, epileptics, and paralytics; and He healed them.
Matt 10
1 And when He had called His twelve disciples to Him, He gave them power over unclean spirits, to cast them out, and to heal all kinds of sickness and all kinds of disease.
Mark 1
34 Then He healed many who were sick with various diseases, and cast out many demons; and He did not allow the demons to speak, because they knew Him.
Demon possession is clearly not synonymous with disease.
Matt 4
Then His fame went throughout all Syria; and they brought to Him all sick people who were afflicted with various diseases and torments, and those who were demon-possessed, epileptics, and paralytics; and He healed them.
Matt 10
1 And when He had called His twelve disciples to Him, He gave them power over unclean spirits, to cast them out, and to heal all kinds of sickness and all kinds of disease.
Mark 1
34 Then He healed many who were sick with various diseases, and cast out many demons; and He did not allow the demons to speak, because they knew Him.
Demon possession is clearly not synonymous with disease.