Parallel World : Satan, Jinn, Angel

Do you believe in ghost? Are they for real?

No, they is no such thing as ghost !! But there are angel, satan, dead spirit, and genie (jin).

Satan : (Syaitan) According to the Qur'an (the basic source of Islamic belief), when God created Adam (pbuh) and directed the assembly of angels to prostrate before Adam (pbuh), Iblis - a Jinn - was also present in the court. All the angels obediently prostrated before Adam (pbuh). However, Iblis - the Jinn - arrogantly refused to do so. This, obviously, was a transgression on the part of Iblis. It was this transgression of Iblis that made him deserving of the name 'Al-Shaitaan'[1] (the Satan). As a result of this transgression, God turned Iblis out of His court and sentenced him to punishment. However, Iblis asked God for respite till the Day of Judgment and declared that because God had turned him out of his court and had sentenced him to punishment because of man, he would therefore always be an enemy to man. He, and those who become his agents, would do all that they can to turn man away from the path of God and as a consequence, suffer the everlasting punishment of hellfire..

Angel : (Malaikat) Angels are unseen beings of a luminous and spiritual substance that act as intermediaries between God and the visible world. Belief in their existence enters into the definition of faith itself: "The Messenger believes in what was sent down to him from his Lord, and the believers: Each one believes in God, His angels, His Books, and His Messengers" (Quran II:285; cf. II:177, IV:136)

Jinn : (Jin) The Jinn are beings created with free will, living on earth in a world parallel to mankind. The Arabic word Jinn is from the verb 'Janna' which means to hide or conceal. Thus, they are physically invisible from man as their description suggests. This invisibility is one of the reasons why some people have denied their existence. However, (as will be seen) the affect which the world of the Jinn has upon our world, is enough to refute this modern denial of one of Allah's creation. The origins of the Jinn can be traced from the Qur'an and the Sunnah. Allah says: "Indeed We created man from dried clay of black smooth mud. And We created the Jinn before that from the smokeless flame of fire" [Surah Al-Hijr 15:26-27]

Dead Spirit : Qur'an tells us that after a person dies, a curtain lies between the dead and the world (Al-Muminoon 23: 100), which, implies that the connection of the dead with this world is completely broken. The Qur'an has also informed us about two other beings - i.e. angels and jinn - that exist and can, at times, interact with humans.

When people die; people will be clearly divided in three groups:
1) those, who excel in piety, truthfulness, justice and submission to God;
2) those, who excel in transgression, rejection and are clearly averse to accepting God's truths;
3) those, who are neither clearly among the first nor clearly among the second group.

As for the first two groups, these are people, who are themselves witnesses upon their own behavior. These are people, whose ultimate destiny - whether it be heaven or hell - is decided during the life of this world and they start enjoying or suffering the fruits of their deeds, immediately after death.

If falling in the first category, they shall be in a state of blissful slumber till the Day of Rising, while if falling in the second category, they shall be in a state of torturous slumber till the Day of ultimate Rising.

The fate of the third category of people, which apparently would be the largest in number in the Hereafter, would be decided on the Day of Judgment. Such people, till the Day of Rising will be in a state of dreamless sleep till the Day of Rising.

http://www.understanding-islam.org/

So guys, see there is no such thing as ghost or wandering spirit with unfinish business. Those were Hollywood piece of crap created to kick of ticket sales for CASPER - The friendly ghost.

Only Angel and Jinn interact with people. See, Angel are good entity, but Jinn are like us, while some are good, there are some bad Jinn. So what usually people think as evil spirit or ghost are actually bad genie..... the kind people bring to Genting one, the same kind playing with Voodoo and the same genie used to possesed people.