What do ghosts, apparitions, fairies, and so called alien entities
have in common?

Answer:

- they can take on different forms (shapeshift}, appear solid or
transparent, appear and dematerialize or be invisible.
- Some of these entities can harm, abduct, deceive or sicken and kill
humans
and animals,
- they are masters of deception and lies
- they can inspire false religions and cults.
- they can move and levitate objects, people and animals,
- they are involved with paranormal phenomena, real magic and can
deceive mystics and people
that are involved with the occult or spiritism, animism, or the
worship

of false gods and idols.
- they can possess people and drive them insane or use them as
channelers and mediums to deliver deceptive messages.
- they can create lying signs and wonders.
- they can disguise themselves as beings or angels of light or can
manifest in hideous forms.
- they can seduce people to follow them into hell and ruin
- ghosts, fairies and alien entities according to many researchers
are
fallen spirits, devils or fallen angels and if they are so they are
afraid  of God and Jesus. See Biblical referernce:

Lev.17

[7] And they shall no more offer their sacrifices unto devils, after
whom they have gone a whoring. This shall be a statute for ever unto
them throughout their generations.
Deut.32

[17] They sacrificed unto devils, not to God; to gods whom they knew
not, to new gods that came newly up, whom your fathers feared not.
2Chr.11

[15] And he ordained him priests for the high places, and for the
devils, and for the calves which he had made.
Pss.106

[7] For ye provoked him that made you by sacrificing unto devils, and
not to God.
[35] For fire shall come upon her from the Everlasting, long to
endure;
and she shall be inhabited of devils for a great time.
Matt.4

[24] And his fame went throughout all Syria: and they brought unto
him
all sick people that were taken with divers diseases and torments,
and
those which were possessed with devils, and those which were
lunatick,
and those that had the palsy; and he healed them.
Matt.7

[22] Many will say to me in that day, Lord, Lord, have we not
prophesied in thy name? and in thy name have cast out devils? and in
thy name done many wonderful works?
Matt.8

[16] When the even was come, they brought unto him many that were
possessed with devils: and he cast out the spirits with his word, and
healed all that were sick:
[28] And when he was come to the other side into the country of the
Gergesenes, there met him two possessed with devils, coming out of
the
tombs, exceeding fierce, so that no man might pass by that way.
[31] So the devils besought him, saying, If thou cast us out, suffer
us
to go away into the herd of swine.
[33] And they that kept them fled, and went their ways into the city,
and told every thing, and what was befallen to the possessed of the
devils.
Matt.9

[8] Heal the sick, cleanse the lepers, raise the dead, cast out
devils:
freely ye have received, freely give.

Matt.12

[24] But when the Pharisees heard it, they said, This fellow doth not
cast out devils, but by Beelzebub the prince of the devils.
[27] And if I by Beelzebub cast out devils, by whom do your children
cast them out? therefore they shall be your judges.
[28] But if I cast out devils by the Spirit of God, then the kingdom
of
God is come unto you.
Mark.1

[32] And at even, when the sun did set, they brought unto him all
that
were diseased, and them that were possessed with devils.
[34] And he healed many that were sick of divers diseases, and cast
out
many devils; and suffered not the devils to speak, because they knew
him.
[39] And he preached in their synagogues throughout all Galilee, and
cast out devils.
Mark.3

[15] And to have power to heal sicknesses, and to cast out devils:
[22] And the scribes which came down from Jerusalem said, He hath
Beelzebub, and by the prince of the devils casteth he out devils.
Mark.5

[12] And all the devils besought him, saying, Send us into the swine,
that we may enter into them.
Mark.6

[13] And they cast out many devils, and anointed with oil many that
were sick, and healed them.
Mark.9

[38] And John answered him, saying, Master, we saw one casting out
devils in thy name, and he followeth not us: and we forbad him,
because
he followeth not us.
Mark.16

[9] Now when Jesus was risen early the first day of the week, he
appeared first to Mary Magdalene, out of whom he had cast seven
devils.
[17] And these signs shall follow them that believe; In my name shall
they cast out devils; they shall speak with new tongues;
Luke.4

[41] And devils also came out of many, crying out, and saying, Thou
art
Christ the Son of God. And he rebuking them suffered them not to
speak:
for they knew that he was Christ.
Luke.8

[2] And certain women, which had been healed of evil spirits and
infirmities, Mary called Magdalene, out of whom went seven devils,
[27] And when he went forth to land, there met him out of the city a
certain man, which had devils long time, and ware no clothes, neither
abode in any house, but in the tombs.
[30] And Jesus asked him, saying, What is thy name? And he said,
Legion: because many devils were entered into him.
[33] Then went the devils out of the man, and entered into the swine:
and the herd ran violently down a steep place into the lake, and were
choked.
[35] Then they went out to see what was done; and came to Jesus, and
found the man, out of whom the devils were departed, sitting at the
feet of Jesus, clothed, and in his right mind: and they were afraid.
[36] They also which saw it told them by what means he that was
possessed of the devils was healed.
[38] Now the man out of whom the devils were departed besought him
that
he might be with him: but Jesus sent him away, saying,
Luke.9

[1] Then he called his twelve disciples together, and gave them power
and authority over all devils, and to cure diseases.
[49] And John answered and said, Master, we saw one casting out
devils
in thy name; and we forbad him, because he followeth not with us.
Luke.10

[17] And the seventy returned again with joy, saying, Lord, even the
devils are subject unto us through thy name.
Luke.11

[15] But some of them said, He casteth out devils through Beelzebub
the
chief of the devils.
[18] If Satan also be divided against himself, how shall his kingdom
stand? because ye say that I cast out devils through Beelzebub.
[19] And if I by Beelzebub cast out devils, by whom do your sons cast
them out? therefore shall they be your judges.
[20] But if I with the finger of God cast out devils, no doubt the
kingdom of God is come upon you.
Luke.13

[32] And he said unto them, Go ye, and tell that fox, Behold, I cast
out devils, and I do cures to day and to morrow, and the third day I
shall be perfected.
1Cor.10

[20] But I say, that the things which the Gentiles sacrifice, they
sacrifice to devils, and not to God: and I would not that ye should
have fellowship with devils.
[21] Ye cannot drink the cup of the Lord, and the cup of devils: ye
cannot be partakers of the Lord's table, and of the table of devils.
1Tim.4

[1] Now the Spirit speaketh expressly, that in the latter times some
shall depart from the faith, giving heed to seducing spirits, and
doctrines of devils;
Jas.2

[19] Thou believest that there is one God; thou doest well: the
devils
also believe, and tremble.
Rev.9

[20] And the rest of the men which were not killed by these plagues
yet
repented not of the works of their hands, that they should not
worship
devils, and idols of gold, and silver, and brass, and stone, and of
wood: which neither can see, nor hear, nor walk:
Rev.16

[14] For they are the spirits of devils, working miracles, which go
forth unto the kings of the earth and of the whole world, to gather
them to the battle of that great day of God Almighty.
Rev.18

[2] And he cried mightily with a strong voice, saying, Babylon the
great is fallen, is fallen, and is become the habitation of devils,
and
the hold of every foul spirit, and a cage of every unclean and
hateful
bird.