I know these things because I have studied the subject and been taught it. I have heard a number of genuine Christian speakers speak on demonology and other matters which all touch on how how demons operate, its not for the faint hearted and no wonder why people are fed untruths about how demons work and what they get up to.
It is important to bind demons to stop them from working and operating during a service, especially when we have vulnerable people come in who are open to their influence. It has nothing to do with fear but power and control, sure let them run riot 6 days of the week, especially if meetings being held are more occult based and encourage demonic activity, but come Sunday they must be held in check. Demons do not simply sit back and do nothing cause a bunch of Christians turn up.
As for the hymns, I did say that its not every hymn that can be used in such a way, but a lot of the more modern praise music with obscure lyrics can be used by demons. Sure we sing praise to God, angels take up that praise to God, but demons can also use it for Satan if the lyrics are too vague and do not mention Jesus or God direct. One such example, this can be sung by satanists and demons to worship Satan.
Of course this dosnt mean we should not sing it to God, but you have to be more tuned in to what goes on in the spiritual realm and how demons work. This song does not mention God or Jesus anywhere, nor does it specifically mention Jesus death or resurrection.
Over all the earth,
You reign on high,
Every mountain stream,
Every Sunset Sky,
But my one request,
You Lord my only aim,
Is that you'd reign in me again,
Chorus:
Lord Reign in me,
Reign in your power,
Over all my dreams,
In my darkest hour,
YOu are the Lord,
Of all I am,
So won't you reign in me again
Over every thought,
Over every word,
May my life reflect,
The beauty of my Lord,
Cause you mean more to me,
than any earthly thing,
So won't you reign in me again
But a simple old song can not be used by demons for obvious reasons.
Jesus loves me! This I know,
For the Bible tells me so.
Little ones to Him belong;
They are weak, but He is strong.
Chorus:
Yes, Jesus loves me!
Yes, Jesus loves me!
Yes, Jesus loves me!
The Bible tells me so.