Psalm 115:16:

The heaven, even the heavens, are the LORD’S: but the earth hath he given to the children of men.

Notes on Psalm 115:16:

This verse clears up a lot of questions, the most common ones being, “If God is in control, why is everything such a mess?” and “If God is in control, why is there such awful suffering and sickness?”

The answer is simple.  God is NOT in control of the earth.  Man is.  God gave man dominion over the earth; He made the earth for man.  Man messed it up.  Man is still messing it up.

When God has His way, people don’t sin and sickness is healed.  But man doesn’t always obey God and the consequences of sin still run rampant on the earth.  However, Christ has redeemed you from the curses that fall because of sin, including sickness.

See also:

YOU Can Do Miracles
The Kingdom of God Is Here NOW
Who Is in Control of Your Life?
God, Satan or You?
Job Explained
Speaking to Mountains, Trees and Diseases
Working Together with God
How to Be Baptized with the Holy Spirit
Does Mark 11:23 Work for Unbelievers?
Objection: We Cannot Demand Healing from God Because God Is Sovereign
Objection: God Is in Control
Objection: To Preach That Jesus COULD NOT Do Miracles at Nazareth Is to Deny His Deity and God’s Sovereignty.  Therefore, the Only Reason He Could Not Would Be That People Did Not Bring the Sick.
Objection: Everything Happens for a Reason
Objection: God Gives and Takes Away
Objection: Faith Must Be IN GOD (Mark 11:22), So It Is Not Something You Can Use Yourself to Change Things
Objection: Any Other Objection Not Specifically Covered in This Book