Angels and Heaven

Some people believe in Angels and Heaven and some don't. I like to resort to the Bible on these matters. I have chosen the book of Revelation chapter 14 and additional Scriptures. In chapter 14 Angels, Heaven and 144,000 are mentioned.
Please Read Revelation 14:1-20 (NIV)

Then I looked, and there before me was the Lamb, standing on Mount Zion, and with him 144,000 who had his name and his Father's name written on their foreheads. And I heard a sound from heaven like the roar of rushing waters and like a loud peal of thunder. The sound I heard was like that of harpists playing their harps. And they sang a new song before the throne and before the four living creatures and the elders. No one could learn the song except the 144,000 who had been redeemed from the earth. These are those who did not defile themselves with women, for they kept themselves pure. They follow the Lamb wherever he goes. They were purchased from among men and offered as firstfruits to God and the Lamb. No lie was found in their mouths; they are blameless. Then I saw another angel flying in midair, and he had the eternal gospel to proclaim to those who live on the earth--to every nation, tribe, language and people. He said in a loud voice, "Fear God and give him glory, because the hour of his judgment has come. Worship him who made the heavens, the earth, the sea and the springs of water." A second angel followed and said, "Fallen! Fallen is Babylon the Great, which made all the nations drink the maddening wine of her adulteries." A third angel followed them and said in a loud voice: "If anyone worships the beast and his image and receives his mark on the forehead or on the hand, he, too, will drink of the wine of God's fury, which has been poured full strength into the cup of his wrath. He will be tormented with burning sulfur in the presence of the holy angels and of the Lamb. And the smoke of their torment rises for ever and ever. There is no rest day or night for those who worship the beast and his image, or for anyone who receives the mark of his name." This calls for patient endurance on the part of the saints who obey God's commandments and remain faithful to Jesus. Then I heard a voice from heaven say, "Write: Blessed are the dead who die in the Lord from now on." "Yes," says the Spirit, "they will rest from their labor, for their deeds will follow them." I looked, and there before me was a white cloud, and seated on the cloud was one "like a son of man" with a crown of gold on his head and a sharp sickle in his hand. Then another angel came out of the temple and called in a loud voice to him who was sitting on the cloud, "Take your sickle and reap, because the time to reap has come, for the harvest of the earth is ripe." So he who was seated on the cloud swung his sickle over the earth, and the earth was harvested. Another angel came out of the temple in heaven, and he too had a sharp sickle. Still another angel, who had charge of the fire, came from the altar and called in a loud voice to him who had the sharp sickle, "Take your sharp sickle and gather the clusters of grapes from the earth's vine, because its grapes are ripe." The angel swung his sickle on the earth, gathered its grapes and threw them into the great winepress of God's wrath. They were trampled in the winepress outside the city, and blood flowed out of the press, rising as high as the horses' bridles for a distance of 1,600 stadia.

Angels have many functions through out the Bible.
For example:
they guarded the tree of Life in the Garden of Eden,
Genesis 3:24 (NIV)
After he drove the man out, he placed on the east side of the Garden of Eden cherubim and a flaming sword flashing back and forth to guard the way to the tree of life.

announced the birth of Jesus
Luke 2:8-11
And there were shepherds living out in the fields nearby, keeping watch over their flocks at night. An angel of the Lord appeared to them, and the glory of the Lord shone around them, and they were terrified. But the angel said to them, "Do not be afraid. I bring you good news of great joy that will be for all the people. Today in the town of David a Savior has been born to you; he is Christ the Lord.

warned Joseph to escape to Egypt
Matthew 2:13
When they had gone, an angel of the Lord appeared to Joseph in a dream. "Get up," he said, "take the child and his mother and escape to Egypt. Stay there until I tell you, for Herod is going to search for the child to kill him."


Heaven is a real place God lives there.
Matthew 6:9 (NIV)
"This, then, is how you should pray: "'Our Father in heaven, hallowed be your name,

Jesus is preparing a place for us in heaven.
John 14:2 (NIV)
In my Father's house are many rooms; if it were not so, I would have told you. I am going there to prepare a place for you.

The 144,000 are from the tribe of Isreal
Revelation 7:4 (NIV)
Then I heard the number of those who were sealed: 144,000 from all the tribes of Israel.

Revelation Chapter 14
..144,000 who had his name and his Father's name written on their foreheads. (V1)
They will sing a new song. They are the only ones to learn the song. (V3)
These are those who did not defile themselves with women, for they kept themselves pure. They follow the Lamb wherever he goes. They were purchased from among men and offered as firstfruits to God and the Lamb. (v4)
No lie was found in their mouths; they are blameless. (V5)

I was told by a member of an organization that Cornelius was counted among the 144,000.
According to my reading of the scriptures that is not possible. As you read the scripture Cornelius was a gentile. He does not fit the description above.
Acts 10:28 (NIV)
He said to them: "You are well aware that it is against our law for a Jew to associate with a Gentile or visit him. But God has shown me that I should not call any man impure or unclean.

It is very important that we read and study the Bible. I encourage you to read it from cover to cover. If you are new to reading the Bible begin in the new Testament.