Okay, good verse. But you seem to be bringing a lot more to the table than what that verse is saying. A good way to understand what that verse is say is to look at a almost identical verse, with one little difference: Matthew 12:43-45:
"When an evil spirit comes out of a man, it goes through arid places seeking rest and does not find it. Then it says, I will return to the house I left. When it arrives, it finds the house unoccupied, swept clean and put in order. Then it goes and takes seven other spirits more wicked than itself, and they go in and live there. And the final condition of that man is worse than the first."
This is not the "house" of a Christian, but of an unbeliever because the house is not occupied (by the Holy Spirit).
I've been in the same place you have been with spiritual warfare teaching. Most of it is wrong. You have nothing to fear when filled with Christ. Once again, if you want to not listen to secular music for the Glory of God, then Amen. But not out of the fear of satan.
No man i´m not afraid of demons but i´m very carefull with these things.
"2 Corinthians 2:11: in order that Satan might not outwit us. For we are not unaware of his schemes."
That´s why i´m so carefull.
In 1 John 3:4, John 8:34, and others talks about the power of the sin.
"1 John 3:4: Everyone who sins breaks the law; in fact, sin is lawlessness."
That´s what i said that the heavens has laws.
Well i´m reading a book Regions of Cautivity of Ana Mendez Ferrel she are Mexican i don´t know if the books exist in english version. The books teach that demons can take peaces of the soul of a person for different reason one of the reason is the sin, and the book teach that the evil can take peaces of christians for differents reasons to and teach that we could open doors.
Well i said that when some member of my house put secular music and i´m seepling the spirits attack me but that was in the pass.
I explain to a one of the must spiritual fighters on my church and she toll me the same that you said "A demon can´t enter in your dwelling but you have to cover your room with the blood and separate spiritually your room of the house because your family are open doors"
I think that God lets the bad spirit touch me to let me know that the house has a open door.
Bad spirits can enter in you house even if you are christian if a member open a door but it can´t touch you only if God let it and if He let it if to let you know that something is wrong.
Satanics cartoon: Its one of the most common form of Satan to destroy people.
For example Dragon ball they has a lot of satanics symbols for example the stave in the floor or the man with the three eyes or the man with the six points in the forehead or in one episode the 666 in a car and in apocalipze say very clare that this is the number of the beast (iron maiden song too jaja).
The green man its name in spanidh is picoro is a real demon.
Etc etc etc etc.
Bad musics: I think this is the most powerfull weapon of satan i´ll give only 2 examples 1 is the Emo music that make people fall in depression, suicide, etc.
2 Music that call demons for example a latin music thats sing ... will come ..... will come ... and ... will come to the party (... is to not mention the name of the demon)
And others things the theme is very large.
We have a proverb: "If the demon don´t brother you its because your are not doing damage to the hell"
(jaja a similar song is Storm the gates of hell - demon hunter)