I believe it is possible for Christians to be harassed by demons, but how is it possible for demons to invade a believers body?
This is somewhat related to the first question. I think the best way to understand what is happening is to look at Romans 8:22-23. “We know that the whole creation has been groaning as in the pains of childbirth right up to the present time. Not only so, but we ourselves, who have the first fruits of the Spirit, groan inwardly as we wait eagerly for our adoption as sons, the redemption of our bodies.” (NIV) The reason we can be physically vulnerable to demonic activity is because our physical bodies still await redemption. That is why disease can enter our bodies and even bring death to us. If we understand that the sovereign God can do whatever He pleases, even to using the enemy’s activities for His purposes, then we will not have such difficulty with this issue. And remember that God has given a couple of great promises to stand on. “No temptation has seized you except what is common to man. And God is faithful; he will not let you be tempted beyond what you can bear. But when you a