Does the devil live under earth?

Answer 1

The devil is like God.

He is everywhere at all times.

The only difference is that you can feel the devil.

You know that tingle you get down your spine?

That him licking your back.

If you feel that you should move house before the devil eats your children and throws them up into your face while your burning to death as the flames consume your house and your own guts are being burnt out of your own throat.

tl dr: The devil eats your children...

Answer 2

Satan entered post-Exilic Judaism in spirit form, as a loyal assistant of God, tasked with testing the righteousness of the faithful. As a spirit he did not have physical form and therefore it is meaningless to talk of where he is. Satan does God's bidding everywhere, as we see in the Book of Job.

In Christianity, Satan evolved to become the devil, now seeking to cause the faithful to deviate from righteousness and thus to destroy God's kingdom. He continued to evolve throughout much of the Middle Ages, at times thought of as a repulsive physical being, but at other times as a purely spiritual but fallen angel. The ambiguity continues in belief today, which is why (i) he can be in hell being punished for his disobedience, or (ii) in hell happily punishing the souls of the wicked, yet also (iii) wandering the earth tempting every person alive today.

The notion of the devil living under the earth arose because hell was once thought of as under the earth, just as heaven was thought of as 'up there'. Now we know that heaven is not a place above the earth and hell is not under the earth, but the thought of the devil being 'down below' still survives in the imaginations of some. Just as heaven and hell do not really exist, it is now possible to realise that the devil does not really exist, and is certainly not under the earth.