According to the word of God the answer is flat out no. If you say that God did something you must have scripture to back it up. Here are some verses that prove that God does not make anyone sick or diseased. First note that God says what He means and means what He says. Titus 1:2 In hope of eternal life, which God, that cannot lie, promised before the world began;
Does God want us sick or healthy? 3John 1:2 Beloved, I wish above all things that thou mayest prosper and be in health, even as thy soul prospereth. God’s desire above all things is that we prosper and be and be in good health.
I have heard some people say that God made them diabetic to test them or to be an example for others, lets see. James 1:13 Let no man say when he is tempted, I am tempted of God: for God cannot be tempted with evil, neither tempteth he any man: The word tempted is the Greek word apeiastos meaning not to be tempted and is a derivative of the Greek word peirao meaning to test.
If God cannot lie then check out at this verse. Romans 2:11 For there is no respect of persons with God. If God made one person diabetic and not another person then He would be respecting one of them.
Lastly look at this verse. Matthew 12:25 And Jesus knew their thoughts, and said unto them, Every kingdom divided against itself is brought to desolation; and every city or house divided against itself shall not stand: Throughout the Gospels Jesus Christ healed all manner of sickness and disease. If God made them sick and diseased for some reason and Jesus Christ healed them that would be a house divided.
I encourage you to look at these verses yourself; I used the King James Version.