Well,there are two different point of views,one is spiritual and the other is scientific..
According to Hinduism,
Vedas say that before the creation of the universe Lord Vishnu is sleeping in the ocean of all causes. His bed is a giant serpent with thousands of cobra like hoods. While Vishnu is asleep, a lotus sprouts of his navel (note that navel is symbolized as the root of creation). Inside this lotus, Brahma resides. Brahma represents the universe which we all live in, and it is this Brahma who creates life forms.
Vishnu is the personification of the eternal multiverse that exists forever without any beginning or end. Brahma is the personification of our temporary physical universe that was created in the big bang. Brahma is said to have been created from the navel (which is a single point) of Vishnu, described as a lotus blooming out of the navel, much like our big bang universe.
Now this universe represented by Brahma is not a permanent universe, it is temporary, Brahma lives for 100 years, says the Vedas, and then dies and then a new universe (Brahma) is born. So as per Vedas, our universe lives for 100 years. Talking of time measurements - Brahma lives for hundred years say Vedas and we are in the first day of the 51st year of the Brahma.
In the Rig Veda (the first scripture of Hinduism, containing spiritual and scientific knowledge) it says that the universe was created out of the parts of the body of a single cosmic man Purusha when his body was sacrificed. There the four classes (varnas) of Indian society come from his body: the priest (Brahmin) from his mouth, the warrior (Kshatritya) from his arms, the peasant (Vaishya) from his thighs, and the servant (Shudra) from his legs.
Christians and Jews believe in the making of man by God on the sixth day of creation (some 4,000 years ago) out of clay and in His own image, as told in the Book of Genesis. The Muslims believe, similarly, that Allah created Adam, the first man in Paradise, then the first woman, Hawa (Eve). There they lived a perfect life in a perfect universe, far vaster than ours. They were cast to Earth when they committed the first disobedience of God, after a jealous Satan tricked them.
According to Scientific point of view,About 15 billion years ago a tremendous explosion started the expansion of the universe. This explosion is known as the Big Bang. At the point of this event all of the matter and energy of space was contained at one point. What existed prior to this event is completely unknown and is a matter of pure speculation. This occurrence was not a conventional explosion but rather an event filling all of space with all of the particles of the embryonic universe rushing away from each other. The Big Bang actually consisted of an explosion of space within itself unlike an explosion of a bomb were fragments are thrown outward. The galaxies were not all clumped together, but rather the Big Bang lay the foundations for the universe.
There are several similarities in between the scientific theory and the one which was proposed by Hindu vedas.