Does all sickness come from Satan? Exodus 4:1111 And the Lord said unto him, Who hath made man's mouth? or who maketh the dumb, or deaf, or the seeing, or the blind? have not I the Lord?
We read in scripture about King Azariah being stricken with a disease from the LORD. 2 Kings 15:55 And the Lord smote the king, so that he was a leper unto the day of his death, and dwelt in a several house. And Jotham the king's son was over the house, judging the people of the land.
How about Zechariah who did not believe the angel of the LORD when he was told of John the Baptist. Luke 1:19,20 19 And the angel answering said unto him, I am Gabriel, that stand in the presence of God; and am sent to speak unto thee, and to shew thee these glad tidings.20 And, behold, thou shalt be dumb, and not able to speak, until the day that these things shall be performed, because thou believest not my words, which shall be fulfilled in their season.
We can't forget Job who had sores from the top of his head to the bottom of his feet. Job was a great man of faith yet he still suffered greatly.
We can't always blame sickness on Satan. We get older and our bodies breakdown. We will all die. We are a fallen creation living in a fallen world.
Let's look at John 9:1-39 And as Jesus passed by, he saw a man which was blind from his birth 2.And his disciples asked him, saying, Master, who did sin, this man, or his parents, that he was born blind?3 Jesus answered, Neither hath this man sinned, nor his parents: but that the works of God should be made manifest in him.
This man was born blind. Jesus said, "the works of God should be manifested in him."
What about Lazarus who was sick and died and was raised from the dead. God uses sickness for His purpose. He uses it as judgment so we will humble ourselves before Him.
When young babies and children are ill at birth it is not always because of sin. God's ways are not our ways. His thoughts not are not our thoughts. But He has a purpose, we must trust in Him.
We must draw closer to Him not further from Him.