Correction
Satan is not God of this world.
Jesus our Lord and Saviour is! Jesus is still in charge of this world.
This word has been corrupted by Sin so Satan has control over it,
BUT
It (Put Satan as low as possible) can only do things with the apporval of God. So Satatn can do anything with God's permission.
Like Job, Satan was given permission to torment him but that is Satan could do, Satan cannot take his life.
So we Christian are safe from the Devil, because we have JESUS!!
Though we must still watch out step. like if we went and purposely went into to see this Satanic ritual, even you know you shouldn't, you will get spiritually posses.
But yes God is in charge..
Lastly don't worry would the beast would be, no one knows, when the time comes then they will know..
The more important thing is, to be ready for the Lord, so if he does come soon you would be ready..