Here are just a few scriptures.
Lu 11:24 When the unclean spirit is gone out of a man, he walketh through dry places, seeking rest; and finding none, he saith, I will return unto my house whence I came out.
Lu 11:25 And when he cometh, he findeth it swept and garnished.
Lu 11:26 Then goeth he, and taketh to him seven other spirits more wicked than himself; and they enter in, and dwell there: and the last state of that man is worse than the first.
Jas 1:22 But be ye doers of the word, and not hearers only, deceiving your own selves.
Jas 1:23 For if any be a hearer of the word, and not a doer, he is like unto a man beholding his natural face in a glass:
Jas 1:24 For he beholdeth himself, and goeth his way, and straightway forgetteth what manner of man he was.
I believe that Jesus is saying that unless we are regenerated by His Spirit (instead of being reformed) and unless we continue in his word by the spirit we are an open target for the devil.
It seems to me that Satan doesn't care how religious one is or how moral one tries to be (or thinks he is), he wants a place in our lives. I believe the devil enjoys living in a religious persons life more so than a drunk in the bar, because he can do more damage to more people.
He hates God and his creation (man). He doesn't want people to experience God's love in Christ Jesus. The one thing an (unregenerate) religious person can not experience is the love of God and neither can he show it to others. Jesus said we must be born again!
