Christianity
Christianity is a religion based upon the teachings of Jesus. Jesus the son of God, whose mother was the virgin Mary.
Christianity teaches that there is only one God in all existence, that God made the universe, the Earth, and created Adam and Eve. God created man in His image. This does not mean that God has a body of flesh and bones. Image means the likeness of God's character, rationality, etc. Because we are made in the image of God, every person is worthy of respect and honor. Furthermore, this means that we did not evolve through random processes from a single celled organism into rational, emotional beings.
God created Adam and Eve and put them in the Garden of Eden and gave them the freedom to choose between right and wrong. They chose to sin. Sin is doing that which is contrary to the nature and will of God. For example, God cannot lie; therefore, lying is sin. The sin of disobeying God that Adam and Eve committed resulted in them being expelled from the Garden of Eden as well as suffering the effect of death.
As a result of their sin, their children and all of us inherited a sinful nature. In other words, our offspring are not perfect in nature -- we don't have to teach children to be selfish. They know it naturally. That which is sinful cannot produce that which is not sinful.
Christianity teaches that God is a Trinity (Father, Son, and Holy Spirit, not three Gods), that Jesus Christ is the second person of the Trinity, that Jesus died on the cross and rose from the dead physically, that all people are under the righteous judgment of God because all people have sinned against God. It teaches that Jesus is the only way to be saved from the coming judgment of God and that salvation is received by faith in the work of Christ on the cross and not by anything that we can do to please God.
Where all other religions in the world teach that we must do some sort of good in cooperation with God in order to achieve the right to be in God's presence, Christianity is the only religion that teaches salvation by grace. This means that we are not made right before God by our efforts, sincerity, or works. Instead, we are made right before God by faith in what Christ did on the cross.
Christianity further teaches that once a person is "born again" (becomes saved) that the Holy Spirit lives in that person and the person is changed: "Therefore if any man is in Christ, he is a new creature; the old things passed away; behold, new things have come," (2 Cor. 5:17). This means that God actually lives in the person and the Christian then experiences a true and living relationship with God.
Therefore, "What is Christianity?" is best answered by saying that it is a relationship with the true and living God through the person of Jesus Christ by whom we are forgiven of our sins and escape the righteous judgment of God.
Islam
Though the beliefs of Muslims worldwide are about as diverse as those among Christians, there are six basic articles of faith common to nearly all Muslims.
The first of these is that there is no God but Allah. The pre- Islamic Arabs were polytheists. But Muhammed succeeded in leading them to devote themselves solely to the chief God of the pantheon whom they called Allah (which simply means God). To worship or attribute deity to any other being is considered shirk or blasphemy. The Koran mentions numerous names of Allah, and these names are found frequently on the lips of devout Muslims who believe them to have a nearly magical power.
The second article of faith is belief in angels and jinn. Jinn are spirit beings capable of both good and evil actions and of possessing human beings. Above the jinn in rank are the angels of God. Two of them are believed to accompany every Muslim, one on the right to record his good deeds, and one on the left to record his evil deeds.
The third article is belief in God's holy books, 104 of which are referred to in the Koran. Chief among these are the Law given to Moses, the Psalms given to David, the Gospel (or Injil) given to Jesus, and the Koran given to Muhammed. Each of these is conceived to have communicated the same basic message of God's will to man. Obvious discrepancies between the Jewish and Christian Scriptures and the Koran (particularly with reference to Jesus and Muhammed) were accounted for by Muhammed in his suggestion that the Bible had been tampered with by Jews and Christians.
The fourth article of faith is belief in God's prophets, through whom Allah appealed to man to follow His will as revealed in His holy books. There is no agreement as to how many prophets there have been--some say hundreds of thousands. Among them were Adam, Noah, Abraham, Moses, and Jesus. But all agree that Muhammed was God's final and supreme prophet--the "seal" of the prophets. Though Muhammed himself said that he was a sinner, nonetheless there are many Muslims throughout the world who appear to come close to worshiping him.
The fifth article of faith is belief in the absolute predestinating will of Allah. Though some Muslims have modified this doctrine somewhat, the Koran seems to support the idea that all things (both good and evil) are the direct result of God's will. Those who conclude that Islam is a fatalistic religion have good reason for doing so.
The sixth and final article of faith is belief in the resurrection and final judgment. At the end of history, God will judge the works of all men. Those whose good deeds outweigh their bad deeds will enter into paradise (pictured in rather sensual terms). The rest will be consigned to hell. The paramount feature of Islamic belief, aside from its strong monotheism, is that it is a religion of human works. One's position with regard to Allah is determined by his success in keeping His laws.
Buddhism
Buddhism is a path of practice and spiritual development leading to Insight into the true nature of life. Buddhist practices such as meditation are means of changing oneself in order to develop the qualities of awareness, kindness, and wisdom. The experience developed within the Buddhist tradition over thousands of years has created an incomparable resource for all those who wish to follow a path — a path which ultimately culminates in Enlightenment or Buddhahood.
Because Buddhism does not include the idea of worshipping a creator god, some people do not see it as a religion in the normal, Western sense. The basic tenets of Buddhist teaching are straightforward and practical: nothing is fixed or permanent; actions have consequences; change is possible. Thus Buddhism addresses itself to all people irrespective of race, nationality, or gender. It teaches practical methods (such as meditation) which enable people to realise and utilise its teachings in order to transform their experience, to be fully responsible for their lives and to develop the qualities of Wisdom and Compassion.
There are around 350 million Buddhists and a growing number of them are Westerners. They follow many different forms of Buddhism, but all traditions are characterised by non-violence, lack of dogma, tolerance of differences, and, usually, by the practice of meditation .
Sikhism
Sikhism is a practical religion. It does not consist in a certain set of beliefs or mere words. Religion does not imply wandering to shrines and tombs, or following austerities of Yogis. Sikhism is a way of life, something to be lived according to a pattern. Its main virtue is simplicity. There is no supernaturalism or mythology on which it rests. It does not believe in devils or angels or heavenly spirits.
Sikhism is a universal religion.
Sikhism is opposed to all ritualism and formalism.
Sikhism does not enjoin blind faith. Blind obedience to an external authority is dis-couraged. The death of the intellect can not be a condition of the life of the spirit. Faith does not start with surmises or absurdities.
Sikhism is a faith of hope and cheer. Though it affirms Karma, it recognises the possibility of the modification of one's Karma with the grace of the Guru or God. It does not lead to despair and defeatism. Sikhism is a democratic religion. The decisions of the Sangat are regarded as resolutions having the force of law (Gurmatta) Guru Gobind Singh Sahib vested the authority of the organisation in the Panth.
Hinduism Hinduism came about when the Aryans conquered most of what is now India. Their many gods meshed with the Indian traditions and forms of meditation to create Hinduism. Hinduism is quite tolerant and allows people to worship the god of their choice or to be atheists. The universe, as well as each human soul, has neither a beginning nor an end. Reincarnation is an endless cycle of birth, payment for sins in a past life, death and rebirth. The grand idea is that someday, mankind will get it right and learn from past mistakes, perfecting society and bringing an end to suffering. There is a final salvation, which is basically an escape from the cycles of life and can mean an eternal resting place. Hindus tend to deny themselves worldly pleasures in an attempt to gain a more desirable life when they return. This is especially true for older people who are beginning to fear their next life.